aboutsummaryrefslogtreecommitdiff
path: root/crypto
diff options
context:
space:
mode:
authorStephan Mueller <smueller@chronox.de>2017-12-08 11:50:37 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2017-12-11 22:29:55 +1100
commitd53c5135792319e095bb126bc43b2ee98586f7fe (patch)
treec7ee7f22e25143a15f5ebeef77430dae79efd14a /crypto
parent9abffc6f2efe46c3564c04312e52e07622d40e51 (diff)
download96b-common-d53c5135792319e095bb126bc43b2ee98586f7fe.tar.gz
crypto: af_alg - fix race accessing cipher request
When invoking an asynchronous cipher operation, the invocation of the callback may be performed before the subsequent operations in the initial code path are invoked. The callback deletes the cipher request data structure which implies that after the invocation of the asynchronous cipher operation, this data structure must not be accessed any more. The setting of the return code size with the request data structure must therefore be moved before the invocation of the asynchronous cipher operation. Fixes: e870456d8e7c ("crypto: algif_skcipher - overhaul memory management") Fixes: d887c52d6ae4 ("crypto: algif_aead - overhaul memory management") Reported-by: syzbot <syzkaller@googlegroups.com> Cc: <stable@vger.kernel.org> # v4.14+ Signed-off-by: Stephan Mueller <smueller@chronox.de> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/algif_aead.c10
-rw-r--r--crypto/algif_skcipher.c10
2 files changed, 10 insertions, 10 deletions
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c
index c8a32bef208a..b73db2b27656 100644
--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -291,6 +291,10 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
/* AIO operation */
sock_hold(sk);
areq->iocb = msg->msg_iocb;
+
+ /* Remember output size that will be generated. */
+ areq->outlen = outlen;
+
aead_request_set_callback(&areq->cra_u.aead_req,
CRYPTO_TFM_REQ_MAY_BACKLOG,
af_alg_async_cb, areq);
@@ -298,12 +302,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
crypto_aead_decrypt(&areq->cra_u.aead_req);
/* AIO operation in progress */
- if (err == -EINPROGRESS || err == -EBUSY) {
- /* Remember output size that will be generated. */
- areq->outlen = outlen;
-
+ if (err == -EINPROGRESS || err == -EBUSY)
return -EIOCBQUEUED;
- }
sock_put(sk);
} else {
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 6fb595cd63ac..baef9bfccdda 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -125,6 +125,10 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
/* AIO operation */
sock_hold(sk);
areq->iocb = msg->msg_iocb;
+
+ /* Remember output size that will be generated. */
+ areq->outlen = len;
+
skcipher_request_set_callback(&areq->cra_u.skcipher_req,
CRYPTO_TFM_REQ_MAY_SLEEP,
af_alg_async_cb, areq);
@@ -133,12 +137,8 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
/* AIO operation in progress */
- if (err == -EINPROGRESS || err == -EBUSY) {
- /* Remember output size that will be generated. */
- areq->outlen = len;
-
+ if (err == -EINPROGRESS || err == -EBUSY)
return -EIOCBQUEUED;
- }
sock_put(sk);
} else {