svn rev #24292: trunk/src/lib/crypto/krb/yarrow/

[epeisach@MIT.EDU]

http://src.mit.edu/fisheye/changelog/krb5/?cs=24292
Commit By: epeisach
Log Message:
ticket: 6772
subject: Ensure valid key in krb5int_yarrow_cipher_encrypt_block

Under low memory conditions (or when testing memory allocation failures), 
the key pointer will be 0 - and not initialized. Test and return failure
before deref a NULL.




Changed Files:
U   trunk/src/lib/crypto/krb/yarrow/ycipher.c
Modified: trunk/src/lib/crypto/krb/yarrow/ycipher.c
===================================================================
--- trunk/src/lib/crypto/krb/yarrow/ycipher.c	2010-09-04 21:43:04 UTC (rev 24291)
+++ trunk/src/lib/crypto/krb/yarrow/ycipher.c	2010-09-04 21:46:53 UTC (rev 24292)
@@ -74,6 +74,12 @@
     krb5_crypto_iov iov;
     const struct krb5_enc_provider *enc = &yarrow_enc_provider;
 
+    /*
+       This can happen if ENOMEM in initializing the key
+       which happens on init or during reseeding
+    */
+    if (!ctx->key)
+        return YARROW_FAIL;
     memcpy(out, in, CIPHER_BLOCK_SIZE);
     iov.flags = KRB5_CRYPTO_TYPE_DATA;
     iov.data = make_data(out, CIPHER_BLOCK_SIZE);