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drm/xe/oa: Limit num_syncs to prevent oversized allocations

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The OA open parameters did not validate num_syncs, allowing
userspace to pass arbitrarily large values, potentially
leading to excessive allocations.

Add check to ensure that num_syncs does not exceed DRM_XE_MAX_SYNCS,
returning -EINVAL when the limit is violated.

v2: use XE_IOCTL_DBG() and drop duplicated check. (Ashutosh)

Fixes: c8507a25ce ("drm/xe/oa/uapi: Define and parse OA sync properties")
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251205234715.2476561-6-shuicheng.lin@intel.com
(cherry picked from commit e057b2d2b8)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
This commit is contained in:
Shuicheng Lin
2025-12-05 23:47:18 +00:00
committed by Thomas Hellström
parent 8e46130400
commit f8dd66bfb4
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/xe/xe_oa.c
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@@ -1254,6 +1254,9 @@ static int xe_oa_set_no_preempt(struct xe_oa *oa, u64 value,
static int xe_oa_set_prop_num_syncs(struct xe_oa *oa, u64 value,
struct xe_oa_open_param *param)
{
if (XE_IOCTL_DBG(oa->xe, value > DRM_XE_MAX_SYNCS))
return -EINVAL;
param->num_syncs = value;
return 0;
}