netdev - Re: [PATCH] net: sctp: fix skb leak in sctp_inq

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Message-ID: <20240209134703.63a9167b@kernel.org>
Date: Fri, 9 Feb 2024 13:47:03 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Dmitry Antipov <dmantipov@...dex.ru>
Cc: Xin Long <lucien.xin@...il.com>, Marcelo Ricardo Leitner
 <marcelo.leitner@...il.com>, linux-sctp@...r.kernel.org,
 netdev@...r.kernel.org, lvc-project@...uxtesting.org,
 syzbot+8bb053b5d63595ab47db@...kaller.appspotmail.com
Subject: Re: [PATCH] net: sctp: fix skb leak in sctp_inq_free()

On Tue,  6 Feb 2024 12:26:17 +0300 Dmitry Antipov wrote:
> In case of GSO, 'chunk->skb' pointer may point to an entry from
> fraglist created in 'sctp_packet_gso_append()'. To avoid freeing
> random fraglist entry (and so undefined behavior and/or memory
> leak), ensure that 'chunk->skb' is set to 'chunk->head_skb'
> (i.e. fraglist head) before calling 'sctp_chunk_free()'.

The code already exists in another place in this file, let's factor it
out to a helper function.
-- 
pw-bot: cr