This is a note to let you know that I've just added the patch titled
drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()
to the 4.4-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-limit-the-number-of-mip-levels-in-vmw_gb_surface_define_ioctl.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ee9c4e681ec4f58e42a83cb0c22a0289ade1aacf Mon Sep 17 00:00:00 2001
From: Vladis Dronov <vdronov@xxxxxxxxxx>
Date: Fri, 2 Jun 2017 07:42:09 +0200
Subject: drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()
From: Vladis Dronov <vdronov@xxxxxxxxxx>
commit ee9c4e681ec4f58e42a83cb0c22a0289ade1aacf upstream.
The 'req->mip_levels' parameter in vmw_gb_surface_define_ioctl() is
a user-controlled 'uint32_t' value which is used as a loop count limit.
This can lead to a kernel lockup and DoS. Add check for 'req->mip_levels'.
References:
https://bugzilla.redhat.com/show_bug.cgi?id=1437431
Signed-off-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -1293,6 +1293,9 @@ int vmw_gb_surface_define_ioctl(struct d
if (req->multisample_count != 0)
return -EINVAL;
+ if (req->mip_levels > DRM_VMW_MAX_MIP_LEVELS)
+ return -EINVAL;
+
if (unlikely(vmw_user_surface_size == 0))
vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
128;
Patches currently in stable-queue which might be from vdronov@xxxxxxxxxx are
queue-4.4/drm-vmwgfx-limit-the-number-of-mip-levels-in-vmw_gb_surface_define_ioctl.patch