This is a note to let you know that I've just added the patch titled
drm/msm: don't deref error pointer in the msm_fbdev_create error path
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-don-t-deref-error-pointer-in-the-msm_fbdev_create-error-path.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Jun 17 12:13:49 CEST 2018
From: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
Date: Wed, 28 Mar 2018 17:22:16 +0100
Subject: drm/msm: don't deref error pointer in the msm_fbdev_create error path
From: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
[ Upstream commit 789d4c300e10eb2096ee83c3497118e67ccc951e ]
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@xxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_fbdev.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -92,8 +92,7 @@ static int msm_fbdev_create(struct drm_f
if (IS_ERR(fb)) {
dev_err(dev->dev, "failed to allocate fb\n");
- ret = PTR_ERR(fb);
- goto fail;
+ return PTR_ERR(fb);
}
bo = msm_framebuffer_bo(fb, 0);
@@ -151,13 +150,7 @@ static int msm_fbdev_create(struct drm_f
fail_unlock:
mutex_unlock(&dev->struct_mutex);
-fail:
-
- if (ret) {
- if (fb)
- drm_framebuffer_remove(fb);
- }
-
+ drm_framebuffer_remove(fb);
return ret;
}
Patches currently in stable-queue which might be from emil.velikov@xxxxxxxxxxxxx are
queue-4.14/drm-omap-fix-possible-null-ref-issue-in-tiler_reserve_2d.patch
queue-4.14/drm-omap-fix-uninitialized-ret-variable.patch
queue-4.14/drm-msm-don-t-deref-error-pointer-in-the-msm_fbdev_create-error-path.patch
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