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linux/drivers/gpu
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Berkant Koc 96f7de3172 drm/hyperv: validate resolution_count and fix WIN8 fallback 
[ Upstream commit 13d33b9ef6 ]

A SYNTHVID_RESOLUTION_RESPONSE with resolution_count > 64 walks past
the supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the
parse loop. Bound resolution_count against the array size, folded
into the existing zero-check.

When the WIN10 resolution probe fails, the caller in
hyperv_connect_vsp() left hv->screen_*_max / preferred_* unpopulated,
which sets mode_config.max_width / max_height to 0 and makes
drm_internal_framebuffer_create() reject every userspace framebuffer
with -EINVAL. The pre-WIN10 branch had the same gap for
preferred_width / preferred_height. Use a single post-probe fallback
guarded by screen_width_max == 0 so both paths converge on the WIN8
defaults.

Signed-off-by: Berkant Koc <me@berkoc.com>
Assisted-by: Claude:claude-opus-4-7 berkoc-pipeline
Fixes: 76c56a5aff ("drm/hyperv: Add DRM driver for hyperv synthetic video device")
Cc: stable@vger.kernel.org # 5.14+
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Link: https://patch.msgid.link/6945b22419c7d404b4954a113de2ac9c900dba93.1779542874.git.me@berkoc.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-06-19 13:33:48 +02:00
..
drm drm/hyperv: validate resolution_count and fix WIN8 fallback 2026-06-19 13:33:48 +02:00
host1x gpu: host1x: Fix race in syncpt alloc/free 2026-01-19 13:09:22 +01:00
ipu-v3 gpu: ipu-v3: common: Add of_node_put() for reference returned by of_graph_get_port_by_id() 2023-03-10 09:39:20 +01:00
trace gpu/trace: add a gpu total memory usage tracepoint 2020-03-03 17:52:41 -05:00
vga vgaarb: don't pass a cookie to vga_client_register 2021-07-21 10:29:10 +02:00
Makefile gpu/trace: add a gpu total memory usage tracepoint 2020-03-03 17:52:41 -05:00