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

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The commit a22bd630cf ("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: a22bd630cf ("can: hi311x: do not report txerr and rxerr during bus-off")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://patch.msgid.link/20241122221650.633981-5-dario.binacchi@amarulasolutions.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dario Binacchi 2024-11-22 23:15:45 +01:00 committed by Marc Kleine-Budde
parent ee6bf3677a
commit 9ad86d377e
1 changed files with 2 additions and 1 deletions
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3
drivers/net/can/spi/hi311x.c
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@ -671,9 +671,9 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
tx_state = txerr >= rxerr ? new_state : 0;
rx_state = txerr <= rxerr ? new_state : 0;
can_change_state(net, cf, tx_state, rx_state);
netif_rx(skb);
if (new_state == CAN_STATE_BUS_OFF) {
netif_rx(skb);
can_bus_off(net);
if (priv->can.restart_ms == 0) {
priv->force_quit = 1;
@ -684,6 +684,7 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
cf->can_id |= CAN_ERR_CNT;
cf->data[6] = txerr;
cf->data[7] = rxerr;
netif_rx(skb);
}
}