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 <jj@chaosbits.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 62122a1..ef5356c 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -68,8 +68,10 @@
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);