[PATCH v2 2/4] android: binder: Fix null ptr dereference in debug msg

[Sherry Yang]

Don't access next->data in kernel debug message when the
next buffer is null.

Acked-by: Arve HjÃnnevÃg <arve@xxxxxxxxxxx>
Signed-off-by: Sherry Yang <sherryy@xxxxxxxxxxx>
---
 drivers/android/binder_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index e12072b1d507..c2819a3d58a6 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -560,7 +560,7 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
 		binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
 				   "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
 				   alloc->pid, buffer->data,
-				   prev->data, next->data);
+				   prev->data, next ? next->data : NULL);
 		binder_update_page_range(alloc, 0, buffer_start_page(buffer),
 					 buffer_start_page(buffer) + PAGE_SIZE,
 					 NULL);
-- 
2.11.0 (Apple Git-81)