From 269230e7c52623cda279010c8032a6f5b59caaaf Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Mon, 27 Jun 2011 15:45:19 +0800 Subject: [PATCH] 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 Signed-off-by: Herbert Xu --- crypto/algif_hash.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index 62122a1a2f7a..ef5356cd280a 100644 --- 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);