diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-10-31 16:05:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-01 11:42:52 +0300 |
| commit | bf991335b02d62e067e09471b15cf2216d54d5cf (patch) | |
| tree | 0f3442cd42c993f70f50fac62bd131b4a542d061 | |
| parent | 3f6b2bbbee20a5aa52eed1aaea65cdab98aed8c6 (diff) | |
| download | linux-bf991335b02d62e067e09471b15cf2216d54d5cf.tar.xz | |
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 7900d5a39989..7d61d8801220 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -480,7 +480,11 @@ 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 |