From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com [209.85.128.51]) (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 A3518189 for ; Tue, 23 Sep 2025 11:19:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758626360; cv=none; b=TrddVs3hT/8OQOrd3bWLXWO1THg5FBZBBLYUYEE5hlB8oow5g0anWboOY2mlnh0/9ey+lZ1R/RJi0AcJgvtkx9xuKP8BDeOMYvLUPzQ78SYc9dRcIfYKNfe0sHPniYHmoe2Cu6KE5yourtTaKhNDmb5qDhmVfkrb4B8ju/MUonk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758626360; c=relaxed/simple; bh=FhrQh8wlJhkiGsJ13lu3sPHpZl+KsdORpiUvpf3eogg=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=c6uO3SxgMw0P/bIQm9F/bBMbauWX2EH0+IAg85Y/kUSpVGj7lzO63R67d/rLrRg9ECF9/2w9yCHMxah+Qwi+eA7djS2193n4JYMHqZNCBZ9NXuL/CgfcuYseM/faPSPjAUasysqXF9UmwHypvG9GTGx0BwAaWRi8894eDSqzEtQ= 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=D37FU1jK; arc=none smtp.client-ip=209.85.128.51 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="D37FU1jK" Received: by mail-wm1-f51.google.com with SMTP id 5b1f17b1804b1-45df0cde41bso37169055e9.3 for ; Tue, 23 Sep 2025 04:19:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1758626356; x=1759231156; 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=9vLuVuYkRxMOaPm/QX7PGxaAYbQhLbxbW+ekIalkme8=; b=D37FU1jKSGczue9Dgn4zjh9Q/9VOAh+Yxhv0mQl+5nKSGCDiXZGY3pGN4lWAI7UK+K Sr3m8eynRP4a1FkciFF9zEdU7/0a/CSr/F/zJXyewRCuD+KRCdsshMRGIbppC1JiklEU i7gokirPy7078/H9d1e8jgklpRF3/NWc2xfPDSMUAT3kQzMpnQAiMPR59f1BS11i2EFW L2xv5ldWrCMIdDNTg6lFyBIc/HcTjXomjswdeA0ENkpgQmwCyF6nNq2RUDaxXa/Z7ntJ i7qeX4ioCj5dFUh6oPzktQjEn+3HFg+DoAdoqewsIrGAuCWKqUMb0lSkZIfQV92btOo3 h+rA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758626356; x=1759231156; 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=9vLuVuYkRxMOaPm/QX7PGxaAYbQhLbxbW+ekIalkme8=; b=TM62H4Bv6YNmeAtZV73AxJuz1+nuitzIXBGkYK44f/348uZ/9guxlw4+M0wlcfndf+ 8V55G1VVgVJ0eategCN1/4bA8LWjb7+MOW6HS39YX9+PUbsFo+tNa/cPCTf8pFvN601n gVbcOeK2s5ClkoA8K9aZ/qseTftNzkukhZl3heNAlgUzEIg0Xh/0UVQPu0SXv+mkPOHn N7Y9wgzv5q3FuV1NZ9n7WJapaiHe17hwNRfq8xhg5wRCVMKtru3DXdtWpRQvY9e6smN5 qSlflM38kRqcFdny2wTwzDf5MXMBjJQSaaqkCWT7twAMxcRqkoKpE0b1wNK2SjajmcUW wsyg== X-Forwarded-Encrypted: i=1; AJvYcCW/JtXwGmhhyWtntacXStfngawE1eTA6eMb5T/stXECd+zajjVPmyBt99+0WDEZcK4FAQBz6lc=@vger.kernel.org X-Gm-Message-State: AOJu0YzaYT366W9FCwEQ8groFsx30sFcwm19WyAxlwS04FjpZxgwoVU+ 7DQHhIbwQ0gr5FNQqRn6wZbkFT40ER9tYQV/00mBXYMQZbLfDul9RXeDPI5tD8cE9F0= X-Gm-Gg: ASbGncve6493HKvQLlaINT/3+n8T4l7Q9dTrtBwKd/btibCqTFL6kkKzenm3fjjNMtr NG9OIg/Q3X6BJ5cYKMGeVuKjfylj1Pg9ehtLL3/+Num8NAXSvJ/Ev9jhWKmDmcwFhIAVFekf63f ZKm8AKIkRaU3PoEATaR94nMVYfCQhGZdw/y5DCU9iiWFC4/exNv37XAnfdJGm+LZJgH7GSBpgJs P/V4Q58NOZx2g3jyEeS9sGZkhi5Ss15ewYr+Gt0wEdCoCsixnjE5nXP6qWcoosrvYfToKSsomkd niDs3ydv7gF8nSy7Vdj3tHMAG1qJip333hbQ6VP1osTw0jm47GDHOY4tz53fsCKDYw58NOebDgj 2EqP9gN+UfzaRMSAoywDyppBiK4AW X-Google-Smtp-Source: AGHT+IESbMFQk6ILiLYUPMLicqqy9m7l+w2rx4L3CO/8J2ovvY0DfEOMfixD2agK3xBqmlyogy/9iQ== X-Received: by 2002:a05:6000:25c1:b0:3ee:15b4:846c with SMTP id ffacd0b85a97d-405c5ccd2bdmr1761131f8f.28.1758626355940; Tue, 23 Sep 2025 04:19:15 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3ee073f53c4sm24050430f8f.3.2025.09.23.04.19.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Sep 2025 04:19:15 -0700 (PDT) Date: Tue, 23 Sep 2025 14:19:11 +0300 From: Dan Carpenter To: Subbaraya Sundeep Cc: Sunil Goutham , Geetha sowjanya , hariprasad , Bharat Bhushan , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH net] octeontx2-pf: Fix potential use after free in otx2_tc_add_flow() Message-ID: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mailer: git-send-email haha only kidding This code calls kfree_rcu(new_node, rcu) and then dereferences "new_node" and then dereferences it on the next line. Two lines later, we take a mutex so I don't think this is an RCU safe region. Re-order it to do the dereferences before queuing up the free. Fixes: 68fbff68dbea ("octeontx2-pf: Add police action for TC flower") Signed-off-by: Dan Carpenter --- drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c index 5f80b23c5335..26a08d2cfbb1 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c @@ -1326,7 +1326,6 @@ static int otx2_tc_add_flow(struct otx2_nic *nic, free_leaf: otx2_tc_del_from_flow_list(flow_cfg, new_node); - kfree_rcu(new_node, rcu); if (new_node->is_act_police) { mutex_lock(&nic->mbox.lock); @@ -1346,6 +1345,7 @@ static int otx2_tc_add_flow(struct otx2_nic *nic, mutex_unlock(&nic->mbox.lock); } + kfree_rcu(new_node, rcu); return rc; } -- 2.51.0