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| author | Colin Ian King <colin.king@canonical.com> | 2017-09-08 16:02:35 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-10-19 13:05:53 +0200 |
| commit | 62c04647c6f44fa3d5d0c077133da0aa1cbbc34c (patch) | |
| tree | ca5e5a25d5f15253d5ab5bdf23cfef4a9411e01e /net/can | |
| parent | fb5b91d61bebc24686ffc379138fd67808b1a1e6 (diff) | |
| download | linux-0-day-62c04647c6f44fa3d5d0c077133da0aa1cbbc34c.tar.gz linux-0-day-62c04647c6f44fa3d5d0c077133da0aa1cbbc34c.tar.xz | |
can: bcm: check for null sk before deferencing it via the call to sock_net
The assignment of net via call sock_net will dereference sk. This
is performed before a sanity null check on sk, so there could be
a potential null dereference on the sock_net call if sk is null.
Fix this by assigning net after the sk null check. Also replace
the sk == NULL with the more usual !sk idiom.
Detected by CoverityScan CID#1431862 ("Dereference before null check")
Fixes: 384317ef4187 ("can: network namespace support for CAN_BCM protocol")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/bcm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/can/bcm.c b/net/can/bcm.c index 47a8748d953af..13690334efa31 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -1493,13 +1493,14 @@ static int bcm_init(struct sock *sk) static int bcm_release(struct socket *sock) { struct sock *sk = sock->sk; - struct net *net = sock_net(sk); + struct net *net; struct bcm_sock *bo; struct bcm_op *op, *next; - if (sk == NULL) + if (!sk) return 0; + net = sock_net(sk); bo = bcm_sk(sk); /* remove bcm_ops, timer, rx_unregister(), etc. */ |