linux-kernel - Re: [PATCH net] vxlan: Fix uninit-value in vxlan_vnifilter

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Message-ID: <Z5KuHjOPMb_zv5z3@shredder>
Date: Thu, 23 Jan 2025 23:01:18 +0200
From: Ido Schimmel <idosch@...sch.org>
To: Shigeru Yoshida <syoshida@...hat.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH net] vxlan: Fix uninit-value in vxlan_vnifilter_dump()

On Thu, Jan 23, 2025 at 11:57:46PM +0900, Shigeru Yoshida wrote:
> KMSAN reported an uninit-value access in vxlan_vnifilter_dump() [1].
> 
> If the length of the netlink message payload is less than
> sizeof(struct tunnel_msg), vxlan_vnifilter_dump() accesses bytes
> beyond the message. This can lead to uninit-value access. Fix this by
> returning an error in such situations.

[...]

> Fixes: f9c4bb0b245c ("vxlan: vni filtering support on collect metadata device")
> Reported-by: syzkaller <syzkaller@...glegroups.com>
> Signed-off-by: Shigeru Yoshida <syoshida@...hat.com>

Reviewed-by: Ido Schimmel <idosch@...dia.com>