linux-kernel - [PATCH] drm/omapdrm: don't deref error pointer in the omap_fbdev

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Date:   Mon, 28 Dec 2020 10:46:13 +0800
From:   Defang Bo <bodefang@....com>
To:     tomi.valkeinen@...com, airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Defang Bo <bodefang@....com>
Subject: [PATCH] drm/omapdrm: don't deref error pointer in the omap_fbdev_create error path

Similar to commit<789d4c300e10>("drm/msm: don't deref error pointer in the msm_fbdev_create error path"),
the error pointer returned by omap_framebuffer_init() gets passed to drm_framebuffer_remove.
The latter handles only Null pointers,thus a nasty crash will occur.
Drop the unnecessary checks in label fail.

Signed-off-by: Defang Bo <bodefang@....com>
---
 drivers/gpu/drm/omapdrm/omap_fbdev.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index 3f6cfc2..7ba07c8 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -141,8 +141,7 @@ static int omap_fbdev_create(struct drm_fb_helper *helper,
 		 * to unref the bo:
 		 */
 		drm_gem_object_put(fbdev->bo);
-		ret = PTR_ERR(fb);
-		goto fail;
+		return PTR_ERR(fb);
 	}
 
 	/* note: this keeps the bo pinned.. which is perhaps not ideal,
@@ -199,12 +198,7 @@ static int omap_fbdev_create(struct drm_fb_helper *helper,
 	return 0;
 
 fail:
-
-	if (ret) {
-		if (fb)
-			drm_framebuffer_remove(fb);
-	}
-
+	drm_framebuffer_remove(fb);
 	return ret;
 }
 
-- 
2.7.4