svn rev #21920: trunk/src/lib/krb5/ krb/ os/
raeburn@MIT.EDU
raeburn at MIT.EDU
Mon Feb 9 12:53:28 EST 2009
http://src.mit.edu/fisheye/changelog/krb5/?cs=21920
Commit By: raeburn
Log Message:
ticket: 6377
subject: make krb5_free_* functions ignore NULL
This makes them safer to call in various contexts where NULL may leak
through, and makes analysis easier.
Also, remove some checks for NULL before calling a free routine that
will also check for NULL.
Changed Files:
U trunk/src/lib/krb5/krb/free_rtree.c
U trunk/src/lib/krb5/krb/init_ctx.c
U trunk/src/lib/krb5/krb/kfree.c
U trunk/src/lib/krb5/krb/preauth2.c
U trunk/src/lib/krb5/os/free_krbhs.c
U trunk/src/lib/krb5/os/promptusr.c
Modified: trunk/src/lib/krb5/krb/free_rtree.c
===================================================================
--- trunk/src/lib/krb5/krb/free_rtree.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/krb/free_rtree.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -33,6 +33,8 @@
krb5_free_realm_tree(krb5_context context, krb5_principal *realms)
{
register krb5_principal *nrealms = realms;
+ if (realms == NULL)
+ return;
while (*nrealms) {
krb5_free_principal(context, *nrealms);
nrealms++;
Modified: trunk/src/lib/krb5/krb/init_ctx.c
===================================================================
--- trunk/src/lib/krb5/krb/init_ctx.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/krb/init_ctx.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -254,23 +254,16 @@
void KRB5_CALLCONV
krb5_free_context(krb5_context ctx)
{
+ if (ctx == NULL)
+ return;
krb5_os_free_context(ctx);
- if (ctx->in_tkt_ktypes) {
- free(ctx->in_tkt_ktypes);
- ctx->in_tkt_ktypes = 0;
- }
-
- if (ctx->tgs_ktypes) {
- free(ctx->tgs_ktypes);
- ctx->tgs_ktypes = 0;
- }
-
- if (ctx->default_realm) {
- free(ctx->default_realm);
- ctx->default_realm = 0;
- }
-
+ free(ctx->in_tkt_ktypes);
+ ctx->in_tkt_ktypes = 0;
+ free(ctx->tgs_ktypes);
+ ctx->tgs_ktypes = 0;
+ free(ctx->default_realm);
+ ctx->default_realm = 0;
if (ctx->ser_ctx_count && ctx->ser_ctx) {
free(ctx->ser_ctx);
ctx->ser_ctx = 0;
Modified: trunk/src/lib/krb5/krb/kfree.c
===================================================================
--- trunk/src/lib/krb5/krb/kfree.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/krb/kfree.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -1,7 +1,7 @@
/*
* lib/krb5/free/f_addr.c
*
- * Copyright 1990-1998 by the Massachusetts Institute of Technology.
+ * Copyright 1990-1998, 2009 by the Massachusetts Institute of Technology.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
@@ -58,6 +58,8 @@
void KRB5_CALLCONV
krb5_free_address(krb5_context context, krb5_address *val)
{
+ if (val == NULL)
+ return;
if (val->contents)
free(val->contents);
free(val);
@@ -68,9 +70,10 @@
{
register krb5_address **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++) {
- if ((*temp)->contents)
- free((*temp)->contents);
+ free((*temp)->contents);
free(*temp);
}
free(val);
@@ -80,48 +83,44 @@
void KRB5_CALLCONV
krb5_free_ap_rep(krb5_context context, register krb5_ap_rep *val)
{
- if (val->enc_part.ciphertext.data)
- free(val->enc_part.ciphertext.data);
+ if (val == NULL)
+ return;
+ free(val->enc_part.ciphertext.data);
free(val);
}
void KRB5_CALLCONV
krb5_free_ap_req(krb5_context context, register krb5_ap_req *val)
{
- if (val->ticket)
- krb5_free_ticket(context, val->ticket);
- if (val->authenticator.ciphertext.data)
- free(val->authenticator.ciphertext.data);
+ if (val == NULL)
+ return;
+ krb5_free_ticket(context, val->ticket);
+ free(val->authenticator.ciphertext.data);
free(val);
}
void KRB5_CALLCONV
krb5_free_ap_rep_enc_part(krb5_context context, krb5_ap_rep_enc_part *val)
{
- if (val->subkey)
- krb5_free_keyblock(context, val->subkey);
+ if (val == NULL)
+ return;
+ krb5_free_keyblock(context, val->subkey);
free(val);
}
void KRB5_CALLCONV
krb5_free_authenticator_contents(krb5_context context, krb5_authenticator *val)
{
- if (val->checksum) {
- krb5_free_checksum(context, val->checksum);
- val->checksum = 0;
- }
- if (val->client) {
- krb5_free_principal(context, val->client);
- val->client = 0;
- }
- if (val->subkey) {
- krb5_free_keyblock(context, val->subkey);
- val->subkey = 0;
- }
- if (val->authorization_data) {
- krb5_free_authdata(context, val->authorization_data);
- val->authorization_data = 0;
- }
+ if (val == NULL)
+ return;
+ krb5_free_checksum(context, val->checksum);
+ val->checksum = 0;
+ krb5_free_principal(context, val->client);
+ val->client = 0;
+ krb5_free_keyblock(context, val->subkey);
+ val->subkey = 0;
+ krb5_free_authdata(context, val->authorization_data);
+ val->authorization_data = 0;
}
void KRB5_CALLCONV
@@ -129,9 +128,10 @@
{
register krb5_authdata **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++) {
- if ((*temp)->contents)
- free((*temp)->contents);
+ free((*temp)->contents);
free(*temp);
}
free(val);
@@ -140,6 +140,8 @@
void KRB5_CALLCONV
krb5_free_authenticator(krb5_context context, krb5_authenticator *val)
{
+ if (val == NULL)
+ return;
krb5_free_authenticator_contents(context, val);
free(val);
}
@@ -147,6 +149,8 @@
void KRB5_CALLCONV
krb5_free_checksum(krb5_context context, register krb5_checksum *val)
{
+ if (val == NULL)
+ return;
krb5_free_checksum_contents(context, val);
free(val);
}
@@ -154,19 +158,19 @@
void KRB5_CALLCONV
krb5_free_checksum_contents(krb5_context context, register krb5_checksum *val)
{
- if (val->contents) {
- free(val->contents);
- val->contents = 0;
- }
+ if (val == NULL)
+ return;
+ free(val->contents);
+ val->contents = 0;
}
void KRB5_CALLCONV
krb5_free_cred(krb5_context context, register krb5_cred *val)
{
- if (val->tickets)
- krb5_free_tickets(context, val->tickets);
- if (val->enc_part.ciphertext.data)
- free(val->enc_part.ciphertext.data);
+ if (val == NULL)
+ return;
+ krb5_free_tickets(context, val->tickets);
+ free(val->enc_part.ciphertext.data);
free(val);
}
@@ -178,35 +182,25 @@
void KRB5_CALLCONV
krb5_free_cred_contents(krb5_context context, krb5_creds *val)
{
- if (val->client) {
- krb5_free_principal(context, val->client);
- val->client = 0;
- }
- if (val->server) {
- krb5_free_principal(context, val->server);
- val->server = 0;
- }
+ if (val == NULL)
+ return;
+ krb5_free_principal(context, val->client);
+ val->client = 0;
+ krb5_free_principal(context, val->server);
+ val->server = 0;
if (val->keyblock.contents) {
memset(val->keyblock.contents, 0, val->keyblock.length);
free(val->keyblock.contents);
val->keyblock.contents = 0;
}
- if (val->ticket.data) {
- free(val->ticket.data);
- val->ticket.data = 0;
- }
- if (val->second_ticket.data) {
- free(val->second_ticket.data);
- val->second_ticket.data = 0;
- }
- if (val->addresses) {
- krb5_free_addresses(context, val->addresses);
- val->addresses = 0;
- }
- if (val->authdata) {
- krb5_free_authdata(context, val->authdata);
- val->authdata = 0;
- }
+ free(val->ticket.data);
+ val->ticket.data = 0;
+ free(val->second_ticket.data);
+ val->second_ticket.data = 0;
+ krb5_free_addresses(context, val->addresses);
+ val->addresses = 0;
+ krb5_free_authdata(context, val->authdata);
+ val->authdata = 0;
}
void KRB5_CALLCONV
@@ -214,26 +208,20 @@
{
register krb5_cred_info **temp;
- if (val->r_address) {
- krb5_free_address(context, val->r_address);
- val->r_address = 0;
- }
- if (val->s_address) {
- krb5_free_address(context, val->s_address);
- val->s_address = 0;
- }
+ if (val == NULL)
+ return;
+ krb5_free_address(context, val->r_address);
+ val->r_address = 0;
+ krb5_free_address(context, val->s_address);
+ val->s_address = 0;
if (val->ticket_info) {
for (temp = val->ticket_info; *temp; temp++) {
- if ((*temp)->session)
- krb5_free_keyblock(context, (*temp)->session);
- if ((*temp)->client)
- krb5_free_principal(context, (*temp)->client);
- if ((*temp)->server)
- krb5_free_principal(context, (*temp)->server);
- if ((*temp)->caddrs)
- krb5_free_addresses(context, (*temp)->caddrs);
- free((*temp));
+ krb5_free_keyblock(context, (*temp)->session);
+ krb5_free_principal(context, (*temp)->client);
+ krb5_free_principal(context, (*temp)->server);
+ krb5_free_addresses(context, (*temp)->caddrs);
+ free(*temp);
}
free(val->ticket_info);
val->ticket_info = 0;
@@ -244,6 +232,8 @@
void KRB5_CALLCONV
krb5_free_creds(krb5_context context, krb5_creds *val)
{
+ if (val == NULL)
+ return;
krb5_free_cred_contents(context, val);
free(val);
}
@@ -252,14 +242,17 @@
void KRB5_CALLCONV
krb5_free_data(krb5_context context, krb5_data *val)
{
- if (val->data)
- free(val->data);
+ if (val == NULL)
+ return;
+ free(val->data);
free(val);
}
void KRB5_CALLCONV
krb5_free_data_contents(krb5_context context, krb5_data *val)
{
+ if (val == NULL)
+ return;
if (val->data) {
free(val->data);
val->data = 0;
@@ -268,45 +261,41 @@
void krb5_free_etype_info(krb5_context context, krb5_etype_info info)
{
- int i;
+ int i;
- for(i=0; info[i] != NULL; i++) {
- if (info[i]->salt)
- free(info[i]->salt);
- krb5_free_data_contents( context, &info[i]->s2kparams);
- free(info[i]);
- }
- free(info);
+ if (info == NULL)
+ return;
+ for (i=0; info[i] != NULL; i++) {
+ free(info[i]->salt);
+ krb5_free_data_contents(context, &info[i]->s2kparams);
+ free(info[i]);
+ }
+ free(info);
}
void KRB5_CALLCONV
krb5_free_enc_kdc_rep_part(krb5_context context, register krb5_enc_kdc_rep_part *val)
{
- if (val->session)
- krb5_free_keyblock(context, val->session);
- if (val->last_req)
- krb5_free_last_req(context, val->last_req);
- if (val->server)
- krb5_free_principal(context, val->server);
- if (val->caddrs)
- krb5_free_addresses(context, val->caddrs);
+ if (val == NULL)
+ return;
+ krb5_free_keyblock(context, val->session);
+ krb5_free_last_req(context, val->last_req);
+ krb5_free_principal(context, val->server);
+ krb5_free_addresses(context, val->caddrs);
free(val);
}
void KRB5_CALLCONV
krb5_free_enc_tkt_part(krb5_context context, krb5_enc_tkt_part *val)
{
- if (val->session)
- krb5_free_keyblock(context, val->session);
- if (val->client)
- krb5_free_principal(context, val->client);
- if (val->transited.tr_contents.data)
- free(val->transited.tr_contents.data);
- if (val->caddrs)
- krb5_free_addresses(context, val->caddrs);
- if (val->authorization_data)
- krb5_free_authdata(context, val->authorization_data);
+ if (val == NULL)
+ return;
+ krb5_free_keyblock(context, val->session);
+ krb5_free_principal(context, val->client);
+ free(val->transited.tr_contents.data);
+ krb5_free_addresses(context, val->caddrs);
+ krb5_free_authdata(context, val->authorization_data);
free(val);
}
@@ -314,30 +303,25 @@
void KRB5_CALLCONV
krb5_free_error(krb5_context context, register krb5_error *val)
{
- if (val->client)
- krb5_free_principal(context, val->client);
- if (val->server)
- krb5_free_principal(context, val->server);
- if (val->text.data)
- free(val->text.data);
- if (val->e_data.data)
- free(val->e_data.data);
+ if (val == NULL)
+ return;
+ krb5_free_principal(context, val->client);
+ krb5_free_principal(context, val->server);
+ free(val->text.data);
+ free(val->e_data.data);
free(val);
}
void KRB5_CALLCONV
krb5_free_kdc_rep(krb5_context context, krb5_kdc_rep *val)
{
- if (val->padata)
- krb5_free_pa_data(context, val->padata);
- if (val->client)
- krb5_free_principal(context, val->client);
- if (val->ticket)
- krb5_free_ticket(context, val->ticket);
- if (val->enc_part.ciphertext.data)
- free(val->enc_part.ciphertext.data);
- if (val->enc_part2)
- krb5_free_enc_kdc_rep_part(context, val->enc_part2);
+ if (val == NULL)
+ return;
+ krb5_free_pa_data(context, val->padata);
+ krb5_free_principal(context, val->client);
+ krb5_free_ticket(context, val->ticket);
+ free(val->enc_part.ciphertext.data);
+ krb5_free_enc_kdc_rep_part(context, val->enc_part2);
free(val);
}
@@ -345,22 +329,16 @@
void KRB5_CALLCONV
krb5_free_kdc_req(krb5_context context, krb5_kdc_req *val)
{
- if (val->padata)
- krb5_free_pa_data(context, val->padata);
- if (val->client)
- krb5_free_principal(context, val->client);
- if (val->server)
- krb5_free_principal(context, val->server);
- if (val->ktype)
- free(val->ktype);
- if (val->addresses)
- krb5_free_addresses(context, val->addresses);
- if (val->authorization_data.ciphertext.data)
- free(val->authorization_data.ciphertext.data);
- if (val->unenc_authdata)
- krb5_free_authdata(context, val->unenc_authdata);
- if (val->second_ticket)
- krb5_free_tickets(context, val->second_ticket);
+ if (val == NULL)
+ return;
+ krb5_free_pa_data(context, val->padata);
+ krb5_free_principal(context, val->client);
+ krb5_free_principal(context, val->server);
+ free(val->ktype);
+ krb5_free_addresses(context, val->addresses);
+ free(val->authorization_data.ciphertext.data);
+ krb5_free_authdata(context, val->unenc_authdata);
+ krb5_free_tickets(context, val->second_ticket);
free(val);
}
@@ -383,6 +361,8 @@
{
register krb5_last_req_entry **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++)
free(*temp);
free(val);
@@ -393,9 +373,10 @@
{
register krb5_pa_data **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++) {
- if ((*temp)->contents)
- free((*temp)->contents);
+ free((*temp)->contents);
free(*temp);
}
free(val);
@@ -415,36 +396,36 @@
free(krb5_princ_component(context, val, i)->data);
free(val->data);
}
- if (val->realm.data)
- free(val->realm.data);
+ free(val->realm.data);
free(val);
}
void KRB5_CALLCONV
krb5_free_priv(krb5_context context, register krb5_priv *val)
{
- if (val->enc_part.ciphertext.data)
- free(val->enc_part.ciphertext.data);
+ if (val == NULL)
+ return;
+ free(val->enc_part.ciphertext.data);
free(val);
}
void KRB5_CALLCONV
krb5_free_priv_enc_part(krb5_context context, register krb5_priv_enc_part *val)
{
- if (val->user_data.data)
- free(val->user_data.data);
- if (val->r_address)
- krb5_free_address(context, val->r_address);
- if (val->s_address)
- krb5_free_address(context, val->s_address);
+ if (val == NULL)
+ return;
+ free(val->user_data.data);
+ krb5_free_address(context, val->r_address);
+ krb5_free_address(context, val->s_address);
free(val);
}
void KRB5_CALLCONV
krb5_free_pwd_data(krb5_context context, krb5_pwd_data *val)
{
- if (val->element)
- krb5_free_pwd_sequences(context, val->element);
+ if (val == NULL)
+ return;
+ krb5_free_pwd_sequences(context, val->element);
free(val);
}
@@ -454,15 +435,13 @@
{
register passwd_phrase_element **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++) {
- if ((*temp)->passwd) {
- krb5_free_data(context, (*temp)->passwd);
- (*temp)->passwd = 0;
- }
- if ((*temp)->phrase) {
- krb5_free_data(context, (*temp)->phrase);
- (*temp)->phrase = 0;
- }
+ krb5_free_data(context, (*temp)->passwd);
+ (*temp)->passwd = 0;
+ krb5_free_data(context, (*temp)->phrase);
+ (*temp)->phrase = 0;
free(*temp);
}
free(val);
@@ -472,14 +451,12 @@
void KRB5_CALLCONV
krb5_free_safe(krb5_context context, register krb5_safe *val)
{
- if (val->user_data.data)
- free(val->user_data.data);
- if (val->r_address)
- krb5_free_address(context, val->r_address);
- if (val->s_address)
- krb5_free_address(context, val->s_address);
- if (val->checksum)
- krb5_free_checksum(context, val->checksum);
+ if (val == NULL)
+ return;
+ free(val->user_data.data);
+ krb5_free_address(context, val->r_address);
+ krb5_free_address(context, val->s_address);
+ krb5_free_checksum(context, val->checksum);
free(val);
}
@@ -487,12 +464,11 @@
void KRB5_CALLCONV
krb5_free_ticket(krb5_context context, krb5_ticket *val)
{
- if (val->server)
- krb5_free_principal(context, val->server);
- if (val->enc_part.ciphertext.data)
- free(val->enc_part.ciphertext.data);
- if (val->enc_part2)
- krb5_free_enc_tkt_part(context, val->enc_part2);
+ if (val == NULL)
+ return;
+ krb5_free_principal(context, val->server);
+ free(val->enc_part.ciphertext.data);
+ krb5_free_enc_tkt_part(context, val->enc_part2);
free(val);
}
@@ -501,6 +477,8 @@
{
register krb5_ticket **temp;
+ if (val == NULL)
+ return;
for (temp = val; *temp; temp++)
krb5_free_ticket(context, *temp);
free(val);
@@ -511,6 +489,8 @@
krb5_free_tgt_creds(krb5_context context, krb5_creds **tgts)
{
register krb5_creds **tgtpp;
+ if (tgts == NULL)
+ return;
for (tgtpp = tgts; *tgtpp; tgtpp++)
krb5_free_creds(context, *tgtpp);
free(tgts);
@@ -519,18 +499,17 @@
void KRB5_CALLCONV
krb5_free_tkt_authent(krb5_context context, krb5_tkt_authent *val)
{
- if (val->ticket)
- krb5_free_ticket(context, val->ticket);
- if (val->authenticator)
- krb5_free_authenticator(context, val->authenticator);
+ if (val == NULL)
+ return;
+ krb5_free_ticket(context, val->ticket);
+ krb5_free_authenticator(context, val->authenticator);
free(val);
}
void KRB5_CALLCONV
krb5_free_unparsed_name(krb5_context context, char *val)
{
- if (val)
- free(val);
+ free(val);
}
void KRB5_CALLCONV
@@ -568,10 +547,8 @@
krb5_free_data_contents(ctx, &sc->sam_response_prompt);
if (sc->sam_pk_for_sad.data)
krb5_free_data_contents(ctx, &sc->sam_pk_for_sad);
- if (sc->sam_cksum.contents) {
- free(sc->sam_cksum.contents);
- sc->sam_cksum.contents = 0;
- }
+ free(sc->sam_cksum.contents);
+ sc->sam_cksum.contents = 0;
}
void KRB5_CALLCONV
@@ -685,10 +662,8 @@
return;
if (psr->sam_key.contents)
krb5_free_keyblock_contents(ctx, &psr->sam_key);
- if (psr->client) {
- krb5_free_principal(ctx, psr->client);
- psr->client = 0;
- }
+ krb5_free_principal(ctx, psr->client);
+ psr->client = 0;
if (psr->msd.data)
krb5_free_data_contents(ctx, &psr->msd);
}
@@ -746,10 +721,8 @@
{
if (req == NULL)
return;
- if (req->user != NULL) {
- krb5_free_principal(context, req->user);
- req->user = NULL;
- }
+ krb5_free_principal(context, req->user);
+ req->user = NULL;
krb5_free_checksum_contents(context, &req->cksum);
krb5_free_data_contents(context, &req->auth_package);
free(req);
@@ -761,18 +734,12 @@
{
if (ref == NULL)
return;
- if (ref->referred_realm) {
- krb5_free_data(context, ref->referred_realm);
- ref->referred_realm = NULL;
- }
- if (ref->true_principal_name != NULL) {
- krb5_free_principal(context, ref->true_principal_name);
- ref->true_principal_name = NULL;
- }
- if (ref->requested_principal_name != NULL) {
- krb5_free_principal(context, ref->requested_principal_name);
- ref->requested_principal_name = NULL;
- }
+ krb5_free_data(context, ref->referred_realm);
+ ref->referred_realm = NULL;
+ krb5_free_principal(context, ref->true_principal_name);
+ ref->true_principal_name = NULL;
+ krb5_free_principal(context, ref->requested_principal_name);
+ ref->requested_principal_name = NULL;
krb5_free_checksum_contents(context, &ref->rep_cksum);
free(ref);
}
@@ -783,10 +750,8 @@
{
if (ref == NULL)
return;
- if (ref->principal != NULL) {
- krb5_free_principal(context, ref->principal);
- ref->principal = NULL;
- }
+ krb5_free_principal(context, ref->principal);
+ ref->principal = NULL;
free(ref);
}
@@ -794,8 +759,6 @@
krb5_free_pa_pac_req(krb5_context context,
krb5_pa_pac_req *req)
{
- if (req == NULL)
- return;
free(req);
}
@@ -804,8 +767,7 @@
krb5_etype_list *etypes)
{
if (etypes != NULL) {
- if (etypes->etypes != NULL)
- free(etypes->etypes);
+ free(etypes->etypes);
free(etypes);
}
}
Modified: trunk/src/lib/krb5/krb/preauth2.c
===================================================================
--- trunk/src/lib/krb5/krb/preauth2.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/krb/preauth2.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -273,7 +273,7 @@
{
int i;
void *pctx;
- if (context->preauth_context != NULL) {
+ if (context && context->preauth_context != NULL) {
for (i = 0; i < context->preauth_context->n_modules; i++) {
pctx = context->preauth_context->modules[i].plugin_context;
if (context->preauth_context->modules[i].client_fini != NULL) {
Modified: trunk/src/lib/krb5/os/free_krbhs.c
===================================================================
--- trunk/src/lib/krb5/os/free_krbhs.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/os/free_krbhs.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -38,6 +38,8 @@
{
register char * const *cp;
+ if (hostlist == NULL)
+ return;
for (cp = hostlist; *cp; cp++)
free(*cp);
free((char *)hostlist);
Modified: trunk/src/lib/krb5/os/promptusr.c
===================================================================
--- trunk/src/lib/krb5/os/promptusr.c 2009-02-09 16:36:09 UTC (rev 21919)
+++ trunk/src/lib/krb5/os/promptusr.c 2009-02-09 17:53:21 UTC (rev 21920)
@@ -126,6 +126,8 @@
{
krb5_uio p, next;
+ if (uio == NULL)
+ return;
for (p = uio; p; p = next) {
next = p->next;
if (p->prompt && (p->flags & KRB5_UIO_FREE_PROMPT))
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