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authorMark Salyzyn <salyzyn@android.com>2015-05-26 08:22:19 -0700
committerDavid S. Miller <davem@davemloft.net>2015-05-26 23:19:29 -0400
commitb48732e4a48d80ed4a14812f0bab09560846514e (patch)
tree979d5c6257fe181758030d4a9d52a257c328cf9a /net
parent983942a5eacae8821882a3d348618b020098e8dc (diff)
downloadkernel-b48732e4a48d80ed4a14812f0bab09560846514e.tar.gz
unix/caif: sk_socket can disappear when state is unlocked
got a rare NULL pointer dereference in clear_bit Signed-off-by: Mark Salyzyn <salyzyn@android.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> ---- 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 Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/caif/caif_socket.c8
-rw-r--r--net/unix/af_unix.c8
2 files changed, 16 insertions, 0 deletions
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index 4ec0c803aef1..112ad784838a 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 5266ea7b922b..06430598cf51 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) {