From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F6A12F12B8; Fri, 17 Oct 2025 15:52:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716353; cv=none; b=pkQCDX7wroYbvFDU1X89A+FKO3f8rR+78NY1/eYTjytfN9BZMRyakDAq3xcYjiqXiDeYz0GxT2tLw3dnikV5PUHrdoC/Vm3DeU+ps/shbrLC8pFtZau1qHG9hC6rZPcCPQZaD524dzlz3fcmd5aaKhJWb89mBa4zwVTsLEf3az8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716353; c=relaxed/simple; bh=F4+pRdxydbv57tiO2ExAKXXoxD3Vo8DCfYXItxJ0Jos=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dltnsv8jLIn6WK3pMwfjyQCibD8gMdBheuiPvtrZ3nVVZPpK/qCFlq1QJXQlosVvw86mNySv0VFdaKfN/XIH5P7NFIV1x3Z6u7ouGpsbyCOnZAsSpHZ3mQyxMMIGPPPqDkaXJLopolhUBP/Tmkuaz0QVbXLeCHlqSJAZIYSXw38= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=b81CnMkW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="b81CnMkW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22D00C4CEE7; Fri, 17 Oct 2025 15:52:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760716353; bh=F4+pRdxydbv57tiO2ExAKXXoxD3Vo8DCfYXItxJ0Jos=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b81CnMkWpLRZ5l1sD0DgQhrQONnWWZZAnSKuq2H6osJ2ea8nDqr9lX7ZicxLWkAHf YpBe87hXysCmsHTNf8oP9Jido6YdC7ymc4+5DL57I3yMJORwWPdTUsrTVa8n6kjtEA 6F0lqiRS4IftzUjg7OXAVrXVYzjy4th0z6/Gq1u4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Tariq Toukan , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 144/276] net/mlx4: prevent potential use after free in mlx4_en_do_uc_filter() Date: Fri, 17 Oct 2025 16:53:57 +0200 Message-ID: <20251017145147.738734095@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145142.382145055@linuxfoundation.org> References: <20251017145142.382145055@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Carpenter [ Upstream commit 4f0d91ba72811fd5dd577bcdccd7fed649aae62c ] Print "entry->mac" before freeing "entry". The "entry" pointer is freed with kfree_rcu() so it's unlikely that we would trigger this in real life, but it's safer to re-order it. Fixes: cc5387f7346a ("net/mlx4_en: Add unicast MAC filtering") Signed-off-by: Dan Carpenter Reviewed-by: Tariq Toukan Link: https://patch.msgid.link/aNvMHX4g8RksFFvV@stanley.mountain Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c index 3bd3603873e32..efbb01460f4ba 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -1176,9 +1176,9 @@ static void mlx4_en_do_uc_filter(struct mlx4_en_priv *priv, mlx4_unregister_mac(mdev->dev, priv->port, mac); hlist_del_rcu(&entry->hlist); - kfree_rcu(entry, rcu); en_dbg(DRV, priv, "Removed MAC %pM on port:%d\n", entry->mac, priv->port); + kfree_rcu(entry, rcu); ++removed; } } -- 2.51.0