diff options
authorHerbert Xu <herbert@gondor.apana.org.au>2014-11-27 22:38:12 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2014-11-28 23:33:18 +0800
commit1e104f9a251b46787c3efc2bc9c8c496dead294b (patch)
parent421d82f5b3e75f94e31875e37d45cdf6a557c120 (diff)
crypto: algif_skcipher - Fixed blocking recvmsg
As most (all?) users of algif_skcipher are single-threaded and therefore always write before reading from an algif_skcipher socket, they never block and exercise that code-path. It turns out that code path doesn't even work because we never reload ctx->used after waking up so we never even see the new data and immediately return an error (and a loud WARN_ON). This patch fixes this by always reloading ctx->used. Reported-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Stephan Mueller <smueller@chronox.de>
1 files changed, 2 insertions, 3 deletions
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 34389964000d..f80e652ef0d0 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -448,14 +448,13 @@ static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
while (!sg->length)
- used = ctx->used;
- if (!used) {
+ if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto unlock;
- used = min_t(unsigned long, used, seglen);
+ used = min_t(unsigned long, ctx->used, seglen);
used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
err = used;

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