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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-10-31 16:05:26 +0300 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-11-09 19:20:43 +0300 |
| commit | e7a6994d043a1e31d5b17706a22ce33d2a3e4cdc (patch) | |
| tree | a31b86c73f54b0587b2ad0be36b1b760466a848d /drivers/net/can/dev.c | |
| parent | 200f5c49f7a2cd694436bfc6cb0662b794c96736 (diff) | |
| download | linux-e7a6994d043a1e31d5b17706a22ce33d2a3e4cdc.tar.xz | |
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/can/dev.c')
| -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 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 |