From: Zhang Shurong zhang_shurong@foxmail.com

commit 3ff256751a2853e1ffaa36958ff933ccc98c6cb5 upstream.

The netif_rx() function frees the skb so we can't dereference it to save the skb->len.

Signed-off-by: Zhang Shurong zhang_shurong@foxmail.com Link: https://lore.kernel.org/r/tencent_3B3D24B66ED66A6BB73CC0E63C6A14E45109@qq.co... Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp [ kovalev: bp to fix CVE-2023-53432 ] Signed-off-by: Vasiliy Kovalev kovalev@altlinux.org --- drivers/firewire/net.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c index 715e491dfbc3..8504e95ede90 100644 --- a/drivers/firewire/net.c +++ b/drivers/firewire/net.c @@ -489,7 +489,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net, bool is_broadcast, u16 ether_type) { struct fwnet_device *dev; - int status; + int status, len; __be64 guid;

switch (ether_type) { @@ -546,13 +546,15 @@ static int fwnet_finish_incoming_packet(struct net_device *net, } skb->protocol = protocol; } + + len = skb->len; status = netif_rx(skb); if (status == NET_RX_DROP) { net->stats.rx_errors++; net->stats.rx_dropped++; } else { net->stats.rx_packets++; - net->stats.rx_bytes += skb->len; + net->stats.rx_bytes += len; }

return 0;