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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2014-11-27 22:38:12 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-11-28 23:33:18 +0800 |
| commit | 1e104f9a251b46787c3efc2bc9c8c496dead294b (patch) | |
| tree | 1fb643e0ec624eb1e2145a6411407f8d27a4e4ce /crypto | |
| parent | 421d82f5b3e75f94e31875e37d45cdf6a557c120 (diff) | |
| download | linux-1e104f9a251b46787c3efc2bc9c8c496dead294b.tar.bz2 | |
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>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/algif_skcipher.c | 5 |
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) sg++; - 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; |