[lvc-project] [PATCH] drm: i915: fix sizeof argument in reset_csb_pointers

[Dmitriy Okunev]

In reset_csb_pointers(), drm_clflush_virt_range() is called with a size
calculated using sizeof(execlists->csb_status), which returns the size
of the pointer rather than the size of the object it points to. This
could lead to incomplete cache flushing on 32-bit systems where pointer
size differs from u64.

Replace sizeof(execlists->csb_status) with
sizeof(*execlists->csb_status).

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: dc0406820ee7 ("drm/i915/gt: Drop invalidate_csb_entries")
Signed-off-by: Dmitriy Okunev <dokunevdmitriy at gmail.com>
---
 drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index e693b0c9d2a3..9ac67a0cbb1f 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2833,7 +2833,7 @@ static void reset_csb_pointers(struct intel_engine_cs *engine)
 	memset(execlists->csb_status, -1, (reset_value + 1) * sizeof(u64));
 	drm_clflush_virt_range(execlists->csb_status,
 			       execlists->csb_size *
-			       sizeof(execlists->csb_status));
+			       sizeof(*execlists->csb_status));
 
 	/* Once more for luck and our trusty paranoia */
 	ENGINE_WRITE(engine, RING_CONTEXT_STATUS_PTR,
-- 
2.53.0