linux-kernel - Re: nvme-tcp: fix a possible UAF when failing to send request

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Message-Id: <D7QEA7XPBML4.1R0M64OD4BH43@bsdbackstore.eu>
Date: Wed, 12 Feb 2025 11:28:34 +0100
From: "Maurizio Lombardi" <mlombard@...backstore.eu>
To: "zhang.guanghui@...tc.cn" <zhang.guanghui@...tc.cn>, "chunguang.xu"
 <chunguang.xu@...pee.com>
Cc: "mgurtovoy" <mgurtovoy@...dia.com>, "sagi" <sagi@...mberg.me>, "kbusch"
 <kbusch@...nel.org>, "sashal" <sashal@...nel.org>, "linux-kernel"
 <linux-kernel@...r.kernel.org>, "linux-nvme"
 <linux-nvme@...ts.infradead.org>, "linux-block"
 <linux-block@...r.kernel.org>
Subject: Re: nvme-tcp: fix a possible UAF when failing to send request

On Wed Feb 12, 2025 at 10:47 AM CET, zhang.guanghui@...tc.cn wrote:
>     Hi, Thanks.
>     I will test this patch, but I am worried whether it will affect the performance.
> Should we also consider null pointer protection?

Yes, it will likely affect the performance, just check if it works.

Probably it could be optimized by just protecting
nvme_tcp_fail_request(), which AFAICT is the only function in the
nvme_tcp_try_send() code that calls nvme_complete_rq().

Maurizio