From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit ad46d7e33219218605ea619e32553daf4f346b9f ]
We need to lock the child socket in hash_check_key as otherwise
two simultaneous calls can cause the parent socket to be freed.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
crypto/algif_hash.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 20550b1..c92b7f6 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -245,22 +245,23 @@ static struct proto_ops algif_hash_ops = {
static int hash_check_key(struct socket *sock)
{
- int err;
+ int err = 0;
struct sock *psk;
struct alg_sock *pask;
struct algif_hash_tfm *tfm;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
+ lock_sock(sk);
if (ask->refcnt)
- return 0;
+ goto unlock_child;
psk = ask->parent;
pask = alg_sk(ask->parent);
tfm = pask->private;
err = -ENOKEY;
- lock_sock(psk);
+ lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
if (!tfm->has_key)
goto unlock;
@@ -274,6 +275,8 @@ static int hash_check_key(struct socket *sock)
unlock:
release_sock(psk);
+unlock_child:
+ release_sock(sk);
return err;
}
--
2.5.0
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