netdev - Re: [PATCH] net/mlx5e: Fix return of a kfree'd object instead of NULL

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Date:   Mon, 28 Feb 2022 23:11:49 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Roi Dayan <roid@...dia.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] net/mlx5e: Fix return of a kfree'd object instead of NULL

On 24 Feb 22:15, Colin Ian King wrote:
>Currently in the case where parse_attr fails to be allocated the memory
>pointed to by attr2 is kfree'd but the non-null pointer attr2 is returned
>and a potential use of a kfree'd object can occur.  Fix this by returning
>NULL to indicate a memory allocation error.
>
>Addresses issue found by clang-scan:
>drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3401:3: warning: Use of
>memory after it is freed [unix.Malloc]
>
>Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions")
>Signed-off-by: Colin Ian King <colin.i.king@...il.com>
Applied to net-next-mlx5
Thanks.