can: dev: __can_get_echo_skb(): print error message, if trying to echo non existing skb

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commit 7da11ba5c5 upstream.

Prior to echoing a successfully transmitted CAN frame (by calling
can_get_echo_skb()), CAN drivers have to put the CAN frame (by calling
can_put_echo_skb() in the transmit function). These put and get function
take an index as parameter, which is used to identify the CAN frame.

A driver calling can_get_echo_skb() with a index not pointing to a skb
is a BUG, so add an appropriate error message.

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>

...

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Marc Kleine-Budde 2018-10-31 14:15:13 +01:00 • committed by Greg Kroah-Hartman

parent e3b8d98e37

commit 474673a94f

1 changed files with 14 additions and 13 deletions

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drivers/net/can/dev.c

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