Re: [PATCH v2 04/12] can: hi311x: fix txerr and rxerr reporting

[Marc Kleine-Budde]

On 22.11.2024 23:15:45, Dario Binacchi wrote:
> The commit a22bd630cfff ("can: hi311x: do not report txerr and rxerr
> during bus-off") removed the reporting of rxerr and txerr even in case
> of correct operation (i. e. not bus-off). The CAN frame is unnecessarily
> set since netif_rx() has already been called. The patch fixes the issue
> by postponing the netif_rx() call in case of txerr and rxerr reporting.

re-phrased to:

can: hi311x: hi3110_can_ist(): fix potential use-after-free

The commit a22bd630cfff ("can: hi311x: do not report txerr and rxerr
during bus-off") removed the reporting of rxerr and txerr even in case
of correct operation (i. e. not bus-off).

The error count information added to the CAN frame after netif_rx() is
a potential use after free, since there is no guarantee that the skb
is in the same state. It might be freed or reused.

Fix the issue by postponing the netif_rx() call in case of txerr and
rxerr reporting.

> Fixes: a22bd630cfff ("can: hi311x: do not report txerr and rxerr during bus-off")
> Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>

regards,
Marc

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