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 EAC5130171A; Wed, 25 Feb 2026 06:57:29 +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=1772002650; cv=none; b=guyfVh2kNLN7Csj+SV9QVQY50uFHAkwlMITUmcuQWXnYuo5qzNLZfV4eEh7v8edSrPnHuleEg+sMmmZ9WeWozsq1djLEfh8/3PI/DfkvtCfoRs8w3Xu0pw/bGeru5jLApbywg1TokxbmnL+5AVBQT6vQ3Fo+8iI2vuzkFmaYmuE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772002650; c=relaxed/simple; bh=eWHrf5I/0sn+FtwXFHYGi6AhCiScjNKQ0qolVyfdYXs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FLF1Z3FdhzfN1gekfos50+K8GaBuLznb5nKWG+fLEjsebTLgIi/sWM+pUD1I2684PXfsAlNBZBOxQf+pHTGC0I2+dkX+9rIE+SZ7PqQkH/JGSbpI0Q0nixqbVCVjR4LCwLN8RjNmZbRDTb3+cebTEL1n3JyEcRZx8jh12QQ74Ls= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FuMXJzbn; 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="FuMXJzbn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4565C116D0; Wed, 25 Feb 2026 06:57:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1772002649; bh=eWHrf5I/0sn+FtwXFHYGi6AhCiScjNKQ0qolVyfdYXs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FuMXJzbnZP0Jn8Cg+zbFFYx07gEuEWSrynCnaAqpAhhNG/LIstDhBTSACZ+AWxIq0 Ah4e/Xe65jXNR2qgXlMJ8DBHMuYEx6VqHntpNrBjwSSIBpSrY5ac+3p4IjJHRpDfKH sbhiL4cPjmYvfPCDmZ/Z1DY80SkeKqkfjagaD5tE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zilin Guan , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.18 380/641] RDMA/mlx5: Fix memory leak in GET_DATA_DIRECT_SYSFS_PATH handler Date: Tue, 24 Feb 2026 17:21:46 -0800 Message-ID: <20260225012357.801768608@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225012348.915798704@linuxfoundation.org> References: <20260225012348.915798704@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zilin Guan [ Upstream commit 9b9d253908478f504297ac283c514e5953ddafa6 ] The UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH) function allocates memory for the device path using kobject_get_path(). If the length of the device path exceeds the output buffer length, the function returns -ENOSPC but does not free the allocated memory, resulting in a memory leak. Add a kfree() call to the error path to ensure the allocated memory is properly freed. Compile tested only. Issue found using a prototype static analysis tool and code review. Fixes: ec7ad6530909 ("RDMA/mlx5: Introduce GET_DATA_DIRECT_SYSFS_PATH ioctl") Signed-off-by: Zilin Guan Link: https://patch.msgid.link/20260126074801.627898-1-zilin@seu.edu.cn Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/hw/mlx5/std_types.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/std_types.c b/drivers/infiniband/hw/mlx5/std_types.c index 2fcf553044e15..1ee31611b4b3f 100644 --- a/drivers/infiniband/hw/mlx5/std_types.c +++ b/drivers/infiniband/hw/mlx5/std_types.c @@ -195,7 +195,7 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH)( int out_len = uverbs_attr_get_len(attrs, MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH); u32 dev_path_len; - char *dev_path; + char *dev_path = NULL; int ret; c = to_mucontext(ib_uverbs_get_ucontext(attrs)); @@ -223,9 +223,9 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH)( ret = uverbs_copy_to(attrs, MLX5_IB_ATTR_GET_DATA_DIRECT_SYSFS_PATH, dev_path, dev_path_len); - kfree(dev_path); end: + kfree(dev_path); mutex_unlock(&dev->data_direct_lock); return ret; } -- 2.51.0