| Message ID | 1432653777-13799-1-git-send-email-salyzyn@android.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
Hi, On Tue, May 26, 2015, at 17:22, Mark Salyzyn wrote: > got a rare NULL pointer dereference in clear_bit > > Signed-off-by: Mark Salyzyn <salyzyn@android.com> IMHO, this is the right approach, I didn't came up with something easier, thanks! Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
From: Hannes Frederic Sowa <hannes@stressinduktion.org> Date: Tue, 26 May 2015 23:24:59 +0200 > On Tue, May 26, 2015, at 17:22, Mark Salyzyn wrote: >> got a rare NULL pointer dereference in clear_bit >> >> Signed-off-by: Mark Salyzyn <salyzyn@android.com> > > IMHO, this is the right approach, I didn't came up with something > easier, thanks! > > Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Applied and queued up for -stable, thanks! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c index 4ec0c80..112ad78 100644 --- a/net/caif/caif_socket.c +++ b/net/caif/caif_socket.c @@ -330,6 +330,10 @@ static long caif_stream_data_wait(struct sock *sk, long timeo) release_sock(sk); timeo = schedule_timeout(timeo); lock_sock(sk); + + if (sock_flag(sk, SOCK_DEAD)) + break; + clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); } @@ -373,6 +377,10 @@ static int caif_stream_recvmsg(struct socket *sock, struct msghdr *msg, struct sk_buff *skb; lock_sock(sk); + if (sock_flag(sk, SOCK_DEAD)) { + err = -ECONNRESET; + goto unlock; + } skb = skb_dequeue(&sk->sk_receive_queue); caif_check_flow_release(sk); diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 5266ea7..0643059 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1880,6 +1880,10 @@ static long unix_stream_data_wait(struct sock *sk, long timeo, unix_state_unlock(sk); timeo = freezable_schedule_timeout(timeo); unix_state_lock(sk); + + if (sock_flag(sk, SOCK_DEAD)) + break; + clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); } @@ -1939,6 +1943,10 @@ static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg, struct sk_buff *skb, *last; unix_state_lock(sk); + if (sock_flag(sk, SOCK_DEAD)) { + err = -ECONNRESET; + goto unlock; + } last = skb = skb_peek(&sk->sk_receive_queue); again: if (skb == NULL) {
got a rare NULL pointer dereference in clear_bit Signed-off-by: Mark Salyzyn <salyzyn@android.com> ---- v2: switch to sock_flag(sk, SOCK_DEAD) and added net/caif/caif_socket.c v3: return -ECONNRESET in upstream caller of wait function for SOCK_DEAD --- net/caif/caif_socket.c | 8 ++++++++ net/unix/af_unix.c | 8 ++++++++ 2 files changed, 16 insertions(+)