linux-kernel - Re: [PATCH] net: ice: Fix potential NULL pointer dereference in ice_bridge

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Message-ID: <20240301152621.GC403078@kernel.org>
Date: Fri, 1 Mar 2024 15:26:21 +0000
From: Simon Horman <horms@...nel.org>
To: Rand Deeb <rand.sec96@...il.com>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	deeb.rand@...fident.ru, lvc-project@...uxtesting.org,
	voskresenski.stanislav@...fident.ru
Subject: Re: [PATCH] net: ice: Fix potential NULL pointer dereference in
 ice_bridge_setlink()

On Wed, Feb 28, 2024 at 06:54:48PM +0300, Rand Deeb wrote:
> The function ice_bridge_setlink() may encounter a NULL pointer dereference
> if nlmsg_find_attr() returns NULL and br_spec is dereferenced subsequently
> in nla_for_each_nested(). To address this issue, add a check to ensure that
> br_spec is not NULL before proceeding with the nested attribute iteration.
> 
> Signed-off-by: Rand Deeb <rand.sec96@...il.com>

Thanks Rand,

I do wonder if for some reason this cannot ever occur.
But assuming it can then I agree with the fix.

Reviewed-by: Simon Horman <horms@...nel.org>

As a fix I think it probably warrants a fixes tag and
being applied to net. As such, the following seems appropriate.

Fixes: b1edc14a3fbf ("ice: Implement ice_bridge_getlink and ice_bridge_setlink")

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