This is a note to let you know that I've just added the patch titled
drm/vmwgfx: Fix order of operation
to the 4.5-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-vmwgfx-fix-order-of-operation.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7851496a32319237456919575e5f4ba62f74cc7d Mon Sep 17 00:00:00 2001
From: Sinclair Yeh <syeh@xxxxxxxxxx>
Date: Thu, 21 Apr 2016 11:29:31 -0700
Subject: drm/vmwgfx: Fix order of operation
From: Sinclair Yeh <syeh@xxxxxxxxxx>
commit 7851496a32319237456919575e5f4ba62f74cc7d upstream.
mode->hdisplay * (var->bits_per_pixel + 7) gets evaluated before
the division, potentially making the pitch larger than it should
be.
Since the original intention is to do a div-round-up, just use
the macro instead.
Signed-off-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_fb.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -573,9 +573,9 @@ static int vmw_fb_set_par(struct fb_info
mode = old_mode;
old_mode = NULL;
} else if (!vmw_kms_validate_mode_vram(vmw_priv,
- mode->hdisplay *
- (var->bits_per_pixel + 7) / 8,
- mode->vdisplay)) {
+ mode->hdisplay *
+ DIV_ROUND_UP(var->bits_per_pixel, 8),
+ mode->vdisplay)) {
drm_mode_destroy(vmw_priv->dev, mode);
return -EINVAL;
}
Patches currently in stable-queue which might be from syeh@xxxxxxxxxx are
queue-4.5/drm-vmwgfx-use-vmw_cmd_dx_cid_check-for-query-commands.patch
queue-4.5/drm-vmwgfx-fix-order-of-operation.patch
queue-4.5/drm-vmwgfx-enable-svga_3d_cmd_dx_set_predication.patch
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