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can: dev: can_put_echo_skb(): don't crash kernel if can_priv::echo_skb is accessed out of bounds

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[ Upstream commit 6411959c10fe917288cbb1038886999148560057 ]

If the "struct can_priv::echoo_skb" is accessed out of bounds, this
would cause a kernel crash. Instead, issue a meaningful warning
message and return with an error.

Fixes: a6e4bc5304 ("can: make the number of echo skb's configurable")
Link: https://lore.kernel.org/all/20231005-can-dev-fix-can-restart-v2-5-91b5c1fd922c@pengutronix.de
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marc Kleine-Budde 2023-09-29 10:23:47 +02:00 committed by Greg Kroah-Hartman
parent 76378a8bae
commit 0d30931f1f
1 changed files with 5 additions and 1 deletions
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6
drivers/net/can/dev/skb.c
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@ -49,7 +49,11 @@ int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
{
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 -EINVAL;
}
/* check flag whether this packet has to be looped back */
if (!(dev->flags & IFF_ECHO) ||