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crypto: algif_hash - Handle initial af_alg_make_sg error correctly

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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 <jj@chaosbits.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2011-06-27 15:45:19 +08:00
parent 36ca239b24
commit 269230e7c5
1 changed files with 3 additions and 1 deletions
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4
crypto/algif_hash.c
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@ -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);