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drm/dumb-buffer: Drop buffer-size limits for now

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The size limits break some of the CI tests. So drop them for now. Keep
the other overflow tests from commit 5ab62dd368 ("drm: prevent integer
overflows in dumb buffer creation helpers") in place.

There is still a pre-existing overflow check for 32-bit type limits in
drm_mode_create_dumb() that will catch the really absurd size requests.
Drivers that still do not use drm_mode_size_dumb() should be updated. The
helper calculates dumb-buffer geometry with overflow checks.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 5ab62dd368 ("drm: prevent integer overflows in dumb buffer creation helpers")
Reported-by: Jani Nikula <jani.nikula@linux.intel.com>
Closes: https://lore.kernel.org/dri-devel/ddf0233e50044059c85279f928661563ef6a55bf@intel.com/
Cc: Rajat Gupta <rajat.gupta@oss.qualcomm.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260602112842.252279-1-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2026-06-02 13:24:01 +02:00
commit 30252e6f71
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/drm_dumb_buffers.c
View file

@ -202,13 +202,6 @@ int drm_mode_create_dumb(struct drm_device *dev,
if (!args->width || !args->height || !args->bpp)
return -EINVAL;
/* Reject unreasonable inputs early. Dumb buffers are for software
* rendering; nothing legitimate needs more than 8192x8192 at 32bpp.
* This prevents overflows in downstream alignment helpers.
*/
if (args->width >= 8192 || args->height >= 8192 || args->bpp > 32)
return -EINVAL;
/* overflow checks for 32bit size calculations */
if (args->bpp > U32_MAX - 8)
return -EINVAL;