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drm/v3d: Reject invalid indirect BO handle in indirect CSD setup

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v3d_get_cpu_indirect_csd_params() looks up the indirect buffer object
from a userspace-supplied handle but never checks the result. A bogus
or stale handle makes drm_gem_object_lookup() return NULL, which is
then stored in info->indirect and only dereferenced later when the
indirect CSD job runs, turning a userspace mistake into a NULL pointer
dereference in the kernel.

Bail out with -ENOENT as soon as the lookup fails, so the bad handle is
rejected at submission time.

Fixes: 18b8413b25 ("drm/v3d: Create a CPU job extension for a indirect CSD job")
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patch.msgid.link/20260703-v3d-cpu-job-fixes-v3-2-bc51b1f3eeb5@igalia.com
This commit is contained in:
Maíra Canal 2026-07-03 12:33:35 -03:00
parent 928caf71e5
commit 2f8b8593c7
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1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/v3d/v3d_submit.c
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@ -495,6 +495,8 @@ v3d_get_cpu_indirect_csd_params(struct drm_file *file_priv,
sizeof(indirect_csd.wg_uniform_offsets));
info->indirect = drm_gem_object_lookup(file_priv, indirect_csd.indirect);
if (!info->indirect)
return -ENOENT;
return v3d_setup_csd_jobs_and_bos(file_priv, v3d, &indirect_csd.submit,
&info->job, &info->clean_job,