linux-kernel - [PATCH] drm/amdgpu: Modify error handling

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Message-ID: <20160804154441.GA12255@amitoj-Inspiron-3542>
Date:	Thu, 4 Aug 2016 21:14:41 +0530
From:	Amitoj Kaur Chawla <amitoj1606@...il.com>
To:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] drm/amdgpu: Modify error handling

To indicate an error, debugfs_create_file can return an ERR_PTR for
!CONFIG_DEBUG_FS and NULL otherwise, so in case the result is
dereferenced there should be a previous IS_ERR and a NULL check.

The Coccinelle semantic patch used to find the issue is as follows:
@@
expression e;
identifier f;
@@

*  e = debugfs_create_file(...);
... when != e == NULL
e->f

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 6553146..4c1a2bc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2143,6 +2143,8 @@ static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
 				  adev, &amdgpu_debugfs_regs_fops);
 	if (IS_ERR(ent))
 		return PTR_ERR(ent);
+	if (!ent)
+		return -ENOMEM;
 	i_size_write(ent->d_inode, adev->rmmio_size);
 	adev->debugfs_regs = ent;
 
-- 
1.9.1