On 11/28/2024 13:28, Eugene Kobyak wrote:
When the intel_context structure contains NULL,
it raises a NULL pointer dereference error in drm_info().
Fixes: e8a3319c31a1 ("drm/i915: Allow error capture without a request")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12309
Cc: John Harrison <John.C.Harrison@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.3+
Signed-off-by: Eugene Kobyak <eugene.kobyak@xxxxxxxxx>
---
v2:
- return drm_info to separate condition
v3:
- create separate condition which generate string if intel_context exist
v4:
- rollback and add check intel_context in log condition
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 135ded17334e..56f05a18870c 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1643,7 +1643,7 @@ capture_engine(struct intel_engine_cs *engine,
return NULL;
intel_engine_get_hung_entity(engine, &ce, &rq);
- if (rq && !i915_request_started(rq))
+ if (rq && !i915_request_started(rq) && ce)
drm_info(&engine->gt->i915->drm, "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
But now you don't get a message when there is a request without the
context pointer. Which can clearly happen because otherwise you wouldn't
have hit a null pointer dereference in the first place.
John.
