Subject: Re: [PATCH v2 net] net: ax25: fix integer overflow in ax25_rx_fragment()

From: Jakub Kicinski <[email-masked]>
Date: Sun, 12 Apr 2026 13:17:51 -0700

On Thu,  9 Apr 2026 10:50:26 +0800 Mashiro Chen wrote:
> Fix mirrors the identical bug fixed in NET/ROM (nr_in.c): check for
> overflow before adding skb->len to fraglen, and abort fragment
> reassembly cleanly if the limit would be exceeded.

Same problem as reported by Simon on the netrom patch applies here.

nit: I don't think you need to cast ax25->fraglen to unsigned int
in the comparison. since it's added with skb->len it should get
auto-prompted to unsigned int.
-- 
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