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authorMarc Kleine-Budde <mkl@pengutronix.de>2018-10-31 14:05:26 +0100
committerMarc Kleine-Budde <mkl@pengutronix.de>2018-11-09 17:20:43 +0100
commite7a6994d043a1e31d5b17706a22ce33d2a3e4cdc (patch)
treea31b86c73f54b0587b2ad0be36b1b760466a848d /drivers/net
parent200f5c49f7a2cd694436bfc6cb0662b794c96736 (diff)
can: dev: __can_get_echo_skb(): Don't crash the kernel if can_priv::echo_skb is accessed out of bounds
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>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/can/dev.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 46cc5fec4043..c05e4d50d43d 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -481,7 +481,11 @@ 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