Add some extra validation to zlib decompression (primarily to shut up…

… a GCC 4.6

warning).


git-svn-id: svn://svn.tartarus.org/sgt/putty@9113 cda61777-01e9-0310-a592-d414129be87e

sshzlib.c

@@ -1259,6 +1259,8 @@ int zlib_decompress_block(void *handle, unsigned char *block, int len,
 		goto finished;
 	    nlen = dctx->bits & 0xFFFF;
 	    EATBITS(16);
+	    if (dctx->uncomplen != (nlen ^ 0xFFFF))
+		goto decode_error;
 	    if (dctx->uncomplen == 0)
 		dctx->state = OUTSIDEBLK;	/* block is empty */
 	    else