This is a note to let you know that I've just added the patch titled
drm: add a check for x/y in drm_mode_setcrtc
to the 4.1-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-add-a-check-for-x-y-in-drm_mode_setcrtc.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 01447e9f04ba1c49a9534ae6a5a6f26c2bb05226 Mon Sep 17 00:00:00 2001
From: Zhao Junwang <zhjwpku@xxxxxxxxx>
Date: Tue, 7 Jul 2015 17:08:35 +0800
Subject: drm: add a check for x/y in drm_mode_setcrtc
From: Zhao Junwang <zhjwpku@xxxxxxxxx>
commit 01447e9f04ba1c49a9534ae6a5a6f26c2bb05226 upstream.
legacy setcrtc ioctl does take a 32 bit value which might indeed
overflow
the checks of crtc_req->x > INT_MAX and crtc_req->y > INT_MAX aren't
needed any more with this
v2: -polish the annotation according to Daniel's comment
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Zhao Junwang <zhjwpku@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2749,8 +2749,11 @@ int drm_mode_setcrtc(struct drm_device *
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
- /* For some reason crtc x/y offsets are signed internally. */
- if (crtc_req->x > INT_MAX || crtc_req->y > INT_MAX)
+ /*
+ * Universal plane src offsets are only 16.16, prevent havoc for
+ * drivers using universal plane code internally.
+ */
+ if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
return -ERANGE;
drm_modeset_lock_all(dev);
Patches currently in stable-queue which might be from zhjwpku@xxxxxxxxx are
queue-4.1/drm-add-a-check-for-x-y-in-drm_mode_setcrtc.patch
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