diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-03-17 08:57:35 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-21 20:40:33 +0200 |
| commit | d93ed9aff64968f4cdad690712eb4f48ae537bde (patch) | |
| tree | 37f7a7fb3243a496c59177f99196b9a6fdda2041 | |
| parent | e3a3bfdbb4b23e140c178c8e61ef68d66803ea2b (diff) | |
can: m_can: m_can_tx_handler(): fix use after free of skb
commit 2e8e79c416aae1de224c0f1860f2e3350fa171f8 upstream.
can_put_echo_skb() will clone skb then free the skb. Move the
can_put_echo_skb() for the m_can version 3.0.x directly before the
start of the xmit in hardware, similar to the 3.1.x branch.
Fixes: 80646733f11c ("can: m_can: update to support CAN FD features")
Link: https://lore.kernel.org/all/20220317081305.739554-1-mkl@pengutronix.de
Cc: stable@vger.kernel.org
Reported-by: Hangyu Hua <hbh25y@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/can/m_can/m_can.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 197c27d8f584..85380b63533f 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1068,8 +1068,6 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, m_can_fifo_write(priv, 0, M_CAN_FIFO_DATA(i / 4), *(u32 *)(cf->data + i)); - can_put_echo_skb(skb, dev, 0); - if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { cccr = m_can_read(priv, M_CAN_CCCR); cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT); @@ -1086,6 +1084,9 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, /* enable first TX buffer to start transfer */ m_can_write(priv, M_CAN_TXBTIE, 0x1); + + can_put_echo_skb(skb, dev, 0); + m_can_write(priv, M_CAN_TXBAR, 0x1); return NETDEV_TX_OK; |