diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-10-31 14:05:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-01 09:46:34 +0100 |
| commit | a48b4b9cd6714f899f05d2580c7efb3700d744f3 (patch) | |
| tree | b5588c7917d78637cee33cf4a6566a0fd173fe7d | |
| parent | 385e1c3bbe57e13115153573747754ca39db80b0 (diff) | |
can: dev: __can_get_echo_skb(): Don't crash the kernel if can_priv::echo_skb is accessed out of bounds
commit e7a6994d043a1e31d5b17706a22ce33d2a3e4cdc upstream.
If the "struct can_priv::echo_skb" is accessed out of bounds would lead
to a kernel crash. Better print a sensible warning message instead and
try to recover.
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/can/dev.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 3ed7d1f48eb0..8b7c6425b681 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -427,7 +427,11 @@ struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 { struct can_priv *priv = netdev_priv(dev); - BUG_ON(idx >= priv->echo_skb_max); + if (idx >= priv->echo_skb_max) { + netdev_err(dev, "%s: BUG! Trying to access can_priv::echo_skb out of bounds (%u/max %u)\n", + __func__, idx, priv->echo_skb_max); + return NULL; + } if (priv->echo_skb[idx]) { /* Using "struct canfd_frame::len" for the frame |