Re: [PATCH v3] net/sched: em_canid: fix uninit-value in em_canid_match

[Marc Kleine-Budde]

On 26.11.2025 14:27:18, ssrane_b23@xxxxxxxxxxxxx wrote:
> From: Shaurya Rane <ssrane_b23@xxxxxxxxxxxxx>
>
> Use pskb_may_pull() to ensure a complete CAN frame is present in the
> linear data buffer before reading the CAN ID. A simple skb->len check
> is insufficient because it only verifies the total data length but does
> not guarantee the data is present in skb->data (it could be in
> fragments).
>
> pskb_may_pull() both validates the length and pulls fragmented data
> into the linear buffer if necessary, making it safe to directly
> access skb->data.
>
> Reported-by: syzbot+5d8269a1e099279152bc@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://syzkaller.appspot.com/bug?extid=5d8269a1e099279152bc
> Fixes: f057bbb6f9ed ("net: em_canid: Ematch rule to match CAN frames according to their identifiers")
> Signed-off-by: Shaurya Rane <ssrane_b23@xxxxxxxxxxxxx>

Applied to linux-can

regards,
Marc

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