File CVE-2012-0050.patch of Package compat-openssl098.703

Index: openssl-0.9.8h/ssl/d1_pkt.c
===================================================================
--- openssl-0.9.8h.orig/ssl/d1_pkt.c
+++ openssl-0.9.8h/ssl/d1_pkt.c
@@ -336,6 +336,7 @@ dtls1_process_record(SSL *s)
 	unsigned int mac_size;
 	unsigned char md[EVP_MAX_MD_SIZE];
 	int decryption_failed_or_bad_record_mac = 0;
+	unsigned char *mac = NULL;
 
 
 	rr= &(s->s3->rrec);
@@ -403,19 +404,15 @@ if (	(sess == NULL) ||
 #endif			
 			}
 		/* check the MAC for rr->input (it's in mac_size bytes at the tail) */
-		if (rr->length < mac_size)
+		if (rr->length >= mac_size)
 			{
-#if 0 /* OK only for stream ciphers */
-			al=SSL_AD_DECODE_ERROR;
-			SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
-			goto f_err;
-#else
-			decryption_failed_or_bad_record_mac = 1;
-#endif
+			rr->length -= mac_size;
+			mac = &rr->data[rr->length];
 			}
-		rr->length-=mac_size;
+		else
+			rr->length = 0;
 		i=s->method->ssl3_enc->mac(s,md,0);
-		if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
+		if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 			{
 			decryption_failed_or_bad_record_mac = 1;
 			}