linux-kernel - Re: [PATCH v2] mctp: fix use after free

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Message-ID: <9f042114f8ac89a59dca9759f3e866de41fcf811.camel@codeconstruct.com.au>
Date:   Tue, 15 Feb 2022 10:26:19 +0800
From:   Jeremy Kerr <jk@...econstruct.com.au>
To:     trix@...hat.com, matt@...econstruct.com.au, davem@...emloft.net,
        kuba@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v2] mctp: fix use after free

Hi Tom,

> Clang static analysis reports this problem
> route.c:425:4: warning: Use of memory after it is freed
>   trace_mctp_key_acquire(key);
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> When mctp_key_add() fails, key is freed but then is later
> used in trace_mctp_key_acquire().  Add an else statement
> to use the key only when mctp_key_add() is successful.
> 
> Fixes: 4f9e1ba6de45 ("mctp: Add tracepoints for tag/key handling")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> v2: change the Fixes: line

Super, thanks!

Acked-off-by: Jeremy Kerr <jk@...econstruct.com.au>

Cheers,


Jeremy