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 610503A80C9; Mon, 5 May 2025 23:17:12 +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=1746487032; cv=none; b=nZf4Y+9ztuOLgA1/zl/7vPi4PIkicoW/hlj7g3QCV17LX0xIc5Flx+yCPIDMMnLIY2GNPr3QdN9IW0hkEWK1kXPMvhEJa8shvkgvNV3/O5U4nSSUYPZxHJbXx5wBpGXVYq8LhXlx+v7F+mqv+LPGs/BCC7gt+ZEEWYyGcAfi4vw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746487032; c=relaxed/simple; bh=aevmSXdNC4LsFWpeszHDUYtW5KdMtvpgExLfkw10oE0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=gYNLY2+6XiIKXBQPCIK3Uo/eZAiO3E0bKjiXyXXZicTxTIjlN6MEa90kL+quVLVSShdZs2raggVNhwgpbYRgZiG4r7dMbHeqfQizuO9NYOucZdCZfxfkgWkOM+y0uYA33KCz8BmyHon5nG2YWaFgAVBVZs7v4Qd2U9ytlk/9bEs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=C4cGfqxj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="C4cGfqxj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C09DCC4CEEF; Mon, 5 May 2025 23:17:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746487032; bh=aevmSXdNC4LsFWpeszHDUYtW5KdMtvpgExLfkw10oE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C4cGfqxjb8GzmpeVg6ld6lvuP/dEYgpsSqTtBw7M7cVy2ukn7nxohSq7uqApDh0Kp TNThxaqB/NNImWL4mnIZksXgCG3J5hTiJEr8ZIfO+RpgzQKQ0EEvcor/3+RtURkSf6 YeS1fFFERrq2D2/Q/ThTwsRA/LHubGdLWEOts6S5gObwfQgzCwA8h+RtfyLhN2aI9l 5qw/cy3HfUvZavYA5DkGf5gYZu3El3ed1Kehs7Xv+VllHMxrpngJ4NsoS29u01mxVK vE2G3thgZO8u89wTZnoLQ9dmWxSNxW+/i1ITGFcBHIWGvN7XW5ONHOhQ8VQDnz1nRV sKfDRtUM+960A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kees Cook , Jakub Kicinski , Sasha Levin , tariqt@nvidia.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, yishaih@nvidia.com, netdev@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 119/153] net/mlx4_core: Avoid impossible mlx4_db_alloc() order value Date: Mon, 5 May 2025 19:12:46 -0400 Message-Id: <20250505231320.2695319-119-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505231320.2695319-1-sashal@kernel.org> References: <20250505231320.2695319-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.181 Content-Transfer-Encoding: 8bit From: Kees Cook [ Upstream commit 4a6f18f28627e121bd1f74b5fcc9f945d6dbeb1e ] GCC can see that the value range for "order" is capped, but this leads it to consider that it might be negative, leading to a false positive warning (with GCC 15 with -Warray-bounds -fdiagnostics-details): ../drivers/net/ethernet/mellanox/mlx4/alloc.c:691:47: error: array subscript -1 is below array bounds of 'long unsigned int *[2]' [-Werror=array-bounds=] 691 | i = find_first_bit(pgdir->bits[o], MLX4_DB_PER_PAGE >> o); | ~~~~~~~~~~~^~~ 'mlx4_alloc_db_from_pgdir': events 1-2 691 | i = find_first_bit(pgdir->bits[o], MLX4_DB_PER_PAGE >> o); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (2) out of array bounds here | (1) when the condition is evaluated to true In file included from ../drivers/net/ethernet/mellanox/mlx4/mlx4.h:53, from ../drivers/net/ethernet/mellanox/mlx4/alloc.c:42: ../include/linux/mlx4/device.h:664:33: note: while referencing 'bits' 664 | unsigned long *bits[2]; | ^~~~ Switch the argument to unsigned int, which removes the compiler needing to consider negative values. Signed-off-by: Kees Cook Link: https://patch.msgid.link/20250210174504.work.075-kees@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlx4/alloc.c | 6 +++--- include/linux/mlx4/device.h | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/alloc.c b/drivers/net/ethernet/mellanox/mlx4/alloc.c index b330020dc0d67..f2bded847e61d 100644 --- a/drivers/net/ethernet/mellanox/mlx4/alloc.c +++ b/drivers/net/ethernet/mellanox/mlx4/alloc.c @@ -682,9 +682,9 @@ static struct mlx4_db_pgdir *mlx4_alloc_db_pgdir(struct device *dma_device) } static int mlx4_alloc_db_from_pgdir(struct mlx4_db_pgdir *pgdir, - struct mlx4_db *db, int order) + struct mlx4_db *db, unsigned int order) { - int o; + unsigned int o; int i; for (o = order; o <= 1; ++o) { @@ -712,7 +712,7 @@ static int mlx4_alloc_db_from_pgdir(struct mlx4_db_pgdir *pgdir, return 0; } -int mlx4_db_alloc(struct mlx4_dev *dev, struct mlx4_db *db, int order) +int mlx4_db_alloc(struct mlx4_dev *dev, struct mlx4_db *db, unsigned int order) { struct mlx4_priv *priv = mlx4_priv(dev); struct mlx4_db_pgdir *pgdir; diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h index 30bb59fe970cb..40ebf0502f427 100644 --- a/include/linux/mlx4/device.h +++ b/include/linux/mlx4/device.h @@ -1115,7 +1115,7 @@ int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt, int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt, struct mlx4_buf *buf); -int mlx4_db_alloc(struct mlx4_dev *dev, struct mlx4_db *db, int order); +int mlx4_db_alloc(struct mlx4_dev *dev, struct mlx4_db *db, unsigned int order); void mlx4_db_free(struct mlx4_dev *dev, struct mlx4_db *db); int mlx4_alloc_hwq_res(struct mlx4_dev *dev, struct mlx4_hwq_resources *wqres, -- 2.39.5