From nobody Wed Dec 17 12:19:16 2025 Received: from mail-wr1-f41.google.com (mail-wr1-f41.google.com [209.85.221.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A217B34BA3B for ; Tue, 30 Sep 2025 12:25:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759235109; cv=none; b=eUCfJe73EzqrNPTZIry639kJVkZ1JQ6Q0Sy4h4l9wr/PulAUsmnnMEQDpQKL4yW7xaIdWXdI0+zCID6mvkFtcrjBZv+oN9Dd44rhxKDdi8CiGF+c5hIWK+CaKRmRv7ebDAytMDW1YylYy1su4SilpFLoicCGb8MbdtWLER4z0CU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759235109; c=relaxed/simple; bh=N3iWQBr+C6sq5xql6Cd1AX/fvpXX92N8aQvLLb5U5E8=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=Xx+bKMX+gHzhvpmRao2PLaABHvF7aJU+WtTYkAanhQoMK35JC25w1TOWwp07QcRFBdVR/Qr5JgCO9IWhFrD4GhAQXLK//oNftOvo1CcsuAfM96l8aSYBdnLhBsfoTEp/JBIRNYX/7Cgz0rBRHqF9n3Q402CECjBeFePlWK7ws2I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=KayxsDOP; arc=none smtp.client-ip=209.85.221.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="KayxsDOP" Received: by mail-wr1-f41.google.com with SMTP id ffacd0b85a97d-3fa528f127fso4627685f8f.1 for ; Tue, 30 Sep 2025 05:25:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1759235105; x=1759839905; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=S6lOcLfmjHHMwdRKIuWAlaFWrbjWxKqUiXJMf1tdzpQ=; b=KayxsDOPIF+Wrm+kQOBRpu9ibozip57hTC9ymTs/ic6YA3Pbm4IV40dKAMSqryYspd wYOS6DtGkLc2WhIJyhphMPUgTdOeGA+gdXj88PhsNyE7E5BS6YHIlYK7eXN6n7RXvKy5 eSsT7uEhGonZxy+jDM8E2dQLHBU3uxHcabK/KgG6+e8WCJZ7EKHuvQs0cPEiCbb2jKlP Nwlcu6c/YZltw9iltwQRCmPej+iXAk/rqErkHoH7uGuuyvNkFNuy7I24Yy+EWl4yNpa0 Hfd6fVPf4HkIFQyqMUm/0NpkNPHTuGHD4sEfrcPMEUtawlOtvTdc7CIvgsC7YtcVvIlx D1vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759235105; x=1759839905; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=S6lOcLfmjHHMwdRKIuWAlaFWrbjWxKqUiXJMf1tdzpQ=; b=bWki1M6Gc9Gmri9SqjLz2Y80FdcFS69CKMpxhp6lK+yvuHdXrAx5Xr9HlZHGD7+6K1 YldxHYPNz8mlWpJO/l5VfVvwrmA2sQ8YnY3gGg9yOS6viyQ4wHT6xOjOquARQVpZbV+/ pDR+lz96wtcm6z5LSq6GX8mhtXi+9PEADRFCni3vdjfTYWk1dkaNht7fKs3V045rCg1V O21xOTbcPyNgOy6lW/26JEnZxxs7fNINFsSXIMgP1RtGls8u2iqKV0ndXFvC4yayalWN etRR+vR1m7yHY/ZA9rX04aLNBxuHxZKU30d0Cs2Zj4sYneA3p3PZFFavQ99P8zEMAfL6 NVhA== X-Forwarded-Encrypted: i=1; AJvYcCXd3MQtxm9dY3s2bJQiNulBqZ328e5WKO/WM88QZae3PdN1iwqvnjuylyokfQ4WKbsw2lNaPeBd5tNWQoM=@vger.kernel.org X-Gm-Message-State: AOJu0YyI3iwv3KWoTs09Gaf1ibrcGDRPp7LbFfHEe7jooTG5RDDmThF0 DWXggaIRqiVQI8EHY7QegJWfI0WfF/nYyDWMpxoguXxNTva5+HNIfZslSdSLqs+SJU4= X-Gm-Gg: ASbGncs74jkAbPNmxebf07ZRCOGzO7VDP8YP2/L+rrr+qfAZqoaiYhBTVzqASF605gn ttizf0CdWonIZfR6OGLlLutTerw0+wGfR16fM+2UkyEjY0qqWrlcfzscWeEJ2Ie1uN6TPnKGuoZ cK576zKfV0HYPnrDEBN7eeCKwADjagmarb+hHU0VX/OnDt3fIuA/Ga7u0jsz76p1w94uIhP2BX4 UZU3bf7SjpM5zb/vEjgGcw7Rc0oDGEworTYq5a5seSfH2Wu42PKlG9mWgFwpxg5tsB874WAJZ1k RmL2Sx4ogOuQWvDeMOYKRKnqdiXPTus6UIxsKNFzYUpsOP2I44v6PCrk8Umolr8D5ppjexMGPYz gRRMCA419787xlHHTCEnliY4DgdiN53S7YFJXneD0ZFLYwHQPC9XUU2FP1o1QvDs= X-Google-Smtp-Source: AGHT+IHLfXLZ95GySBe9ZuBPDMocDcdm4e3YftS67zYrym4isY22xPTXaFrasbFvqRJbXcP0Bwxl5A== X-Received: by 2002:a5d:5888:0:b0:3ea:d634:1493 with SMTP id ffacd0b85a97d-4240f261673mr4414743f8f.3.1759235104947; Tue, 30 Sep 2025 05:25:04 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-40fc82f2ff6sm22407808f8f.56.2025.09.30.05.25.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Sep 2025 05:25:04 -0700 (PDT) Date: Tue, 30 Sep 2025 15:25:01 +0300 From: Dan Carpenter To: Yan Burman Cc: Tariq Toukan , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Amir Vadai , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH net] net/mlx4: prevent potential use after free in mlx4_en_do_uc_filter() Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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/e= thernet/mellanox/mlx4/en_netdev.c index d2071aff7b8f..308b4458e0d4 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -1180,9 +1180,9 @@ static void mlx4_en_do_uc_filter(struct mlx4_en_priv = *priv, mlx4_unregister_mac(mdev->dev, priv->port, mac); =20 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; } } --=20 2.51.0