Commit e16635d88fa0 ("drm/panthor: add DRM fdinfo support") failed to
protect access to groups with an xarray lock, which could lead to
use-after-free errors.
Fixes: e16635d88fa0 ("drm/panthor: add DRM fdinfo support")
Reviewed-by: Boris Brezillon <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Signed-off-by: Adrián Larumbe <[email protected]>
---
drivers/gpu/drm/panthor/panthor_sched.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/panthor/panthor_sched.c
b/drivers/gpu/drm/panthor/panthor_sched.c
index f3c6ca4dc11c..6d49b4f40f58 100644
--- a/drivers/gpu/drm/panthor/panthor_sched.c
+++ b/drivers/gpu/drm/panthor/panthor_sched.c
@@ -2865,6 +2865,7 @@ void panthor_fdinfo_gather_group_samples(struct
panthor_file *pfile)
if (IS_ERR_OR_NULL(gpool))
return;
+ xa_lock(&gpool->xa);
xa_for_each(&gpool->xa, i, group) {
mutex_lock(&group->fdinfo.lock);
pfile->stats.cycles += group->fdinfo.data.cycles;
@@ -2873,6 +2874,7 @@ void panthor_fdinfo_gather_group_samples(struct
panthor_file *pfile)
group->fdinfo.data.time = 0;
mutex_unlock(&group->fdinfo.lock);
}
+ xa_unlock(&gpool->xa);
}
static void group_sync_upd_work(struct work_struct *work)
--
2.47.1
