[PATCH] gpu/drm/xe/xe_devcoredump: Check NULL before dereferencing coredump.

[Himal Prasad Ghimiray]

Derefernce coredump to get xe_devcoredump_snapshot only if coredump is
not NULL.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_devcoredump.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c
index 0fcd30680323..83a1f3cd37cf 100644
--- a/drivers/gpu/drm/xe/xe_devcoredump.c
+++ b/drivers/gpu/drm/xe/xe_devcoredump.c
@@ -74,17 +74,20 @@ static ssize_t xe_devcoredump_read(char *buffer, loff_t offset,
 				   size_t count, void *data, size_t datalen)
 {
 	struct xe_devcoredump *coredump = data;
+	if (!coredump)
+		return -ENODATA;
+
 	struct xe_device *xe = coredump_to_xe(coredump);
+	/* Our device is gone already... */
+	if (!xe)
+		return -ENODEV;
+
 	struct xe_devcoredump_snapshot *ss = &coredump->snapshot;
 	struct drm_printer p;
 	struct drm_print_iterator iter;
 	struct timespec64 ts;
 	int i;
 
-	/* Our device is gone already... */
-	if (!data || !coredump_to_xe(coredump))
-		return -ENODEV;
-
 	/* Ensure delayed work is captured before continuing */
 	flush_work(&ss->work);
 
-- 
2.25.1