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drm/msm: don't deref error pointer in the msm_fbdev_create error path 

Currently the error pointer returned by msm_alloc_stolen_fb gets passed
to drm_framebuffer_remove. The latter handles only NULL pointers, thus
a nasty crash will occur.

Drop the unnecessary fail label and the associated checks - both err and
fb will be set at this stage.

Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Emil Velikov 2018-03-28 17:22:16 +01:00 committed by Rob Clark
parent cf606fe330
commit 641be142bf
1 changed files with 2 additions and 9 deletions
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9
drivers/gpu/drm/msm/msm_fbdev.c
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@ -92,8 +92,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
if (IS_ERR(fb)) { if (IS_ERR(fb)) {
dev_err(dev->dev, "failed to allocate fb\n"); dev_err(dev->dev, "failed to allocate fb\n");
ret = PTR_ERR(fb); return PTR_ERR(fb);
goto fail;
} }
bo = msm_framebuffer_bo(fb, 0); bo = msm_framebuffer_bo(fb, 0);
@ -151,13 +150,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
fail_unlock: fail_unlock:
mutex_unlock(&dev->struct_mutex); mutex_unlock(&dev->struct_mutex);
fail:
if (ret) {
if (fb)
drm_framebuffer_remove(fb); drm_framebuffer_remove(fb);
}
return ret; return ret;
} }