Re: [PATCH v3 net] ax25: fix OOB read after address header strip in ax25_rcv()

[Ashutosh Desai]

On Wed, 15 Apr 2026 08:59:21 +0100, David Laight wrote:
> Is it just worth linearising the skb on entry to all this code?

Thanks for the feedback, David.

skb_linearize() on entry is a nice idea for simplifying sanity checks
overall, but it wouldn't fix this particular bug on its own - the issue
is skb->len dropping to zero after skb_pull(), not non-linear data. We'd
still need a length check regardless. pskb_may_pull(skb, 2) handles both
in one call.

That said, linearizing on entry to ax25_rcv() as a cleanup to simplify
future checks sounds worthwhile - happy to send that as a separate
net-next patch.