Patch "drm/radeon/combios: add some validation of lvds values" has been added to the 3.10-stable tree

Patch "drm/radeon/combios: add some validation of lvds values" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/radeon/combios: add some validation of lvds values

to the 3.10-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-radeon-combios-add-some-validation-of-lvds-values.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0a90a0cff9f429f886f423967ae053150dce9259 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 27 Jul 2015 19:24:31 -0400
Subject: drm/radeon/combios: add some validation of lvds values

From: Alex Deucher <alexander.deucher@amd.com>

commit 0a90a0cff9f429f886f423967ae053150dce9259 upstream.

Fixes a broken hsync start value uncovered by:
abc0b1447d4974963548777a5ba4a4457c82c426
(drm: Perform basic sanity checks on probed modes)

The driver handled the bad hsync start elsewhere, but
the above commit prevented it from getting added.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=91401

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/radeon/radeon_combios.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -1271,10 +1271,15 @@ struct radeon_encoder_lvds *radeon_combi
 
 			if ((RBIOS16(tmp) == lvds->native_mode.hdisplay) &&
 			    (RBIOS16(tmp + 2) == lvds->native_mode.vdisplay)) {
+				u32 hss = (RBIOS16(tmp + 21) - RBIOS16(tmp + 19) - 1) * 8;
+
+				if (hss > lvds->native_mode.hdisplay)
+					hss = (10 - 1) * 8;
+
 				lvds->native_mode.htotal = lvds->native_mode.hdisplay +
 					(RBIOS16(tmp + 17) - RBIOS16(tmp + 19)) * 8;
 				lvds->native_mode.hsync_start = lvds->native_mode.hdisplay +
-					(RBIOS16(tmp + 21) - RBIOS16(tmp + 19) - 1) * 8;
+					hss;
 				lvds->native_mode.hsync_end = lvds->native_mode.hsync_start +
 					(RBIOS8(tmp + 23) * 8);
 


Patches currently in stable-queue which might be from alexander.deucher@amd.com are

queue-3.10/drm-radeon-combios-add-some-validation-of-lvds-values.patch