crypto: algif_hash - Handle initial af_alg_make_sg error correctly

When the first call to af_alg_make_sg fails, we may return garbage instead of the real error. This patch fixes it by setting the error if "copied" is zero. Based on a patch by Jesper Juhl. Reported-by: Jesper Juhl <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
chewitt · Jun 29, 2011 · 269230e · 269230e
1 parent 36ca239
commit 269230e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
@@ -68,8 +68,10 @@ static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
 			int newlen;
 
 			newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
-			if (newlen < 0)
+			if (newlen < 0) {
+				err = copied ? 0 : newlen;
 				goto unlock;
+			}
 
 			ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
 						newlen);