[PATCH] drm/exynos: vidi: use memdup_user() instead of kmalloc() and copy_from_user()

[mdshahid03 at gmail.com]

From: Mohammad Shahid <mdshahid03 at gmail.com>

Use memdup_user() to replace the open-coded kmalloc() and
copy_from_user() sequence.

This simplifies the code while preserving the existing behavior.

This issue was reported by memdup_user.cocci.

Signed-off-by: Mohammad Shahid <mdshahid03 at gmail.com>
---
 drivers/gpu/drm/exynos/exynos_drm_vidi.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index 67bbf9b8bc0e..183671de711e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -273,14 +273,9 @@ int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 
 		size = (hdr.extensions + 1) * EDID_LENGTH;
 
-		edid_buf = kmalloc(size, GFP_KERNEL);
-		if (!edid_buf)
-			return -ENOMEM;
-
-		if (copy_from_user(edid_buf, edid_userptr, size)) {
-			kfree(edid_buf);
-			return -EFAULT;
-		}
+		edid_buf = memdup_user(edid_userptr, size);
+		if (IS_ERR(edid_buf))
+			return PTR_ERR(edid_buf);
 
 		drm_edid = drm_edid_alloc(edid_buf, size);
 		kfree(edid_buf);
-- 
2.43.0