FROMLIST: android: binder: Fix null ptr dereference in debug msg
(from https://patchwork.kernel.org/patch/9990323/)
Don't access next->data in kernel debug message when the
next buffer is null.
Bug: 36007193
Change-Id: Ib8240d7e9a7087a2256e88c0ae84b9df0f2d0224
Acked-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Sherry Yang <sherryy@android.com>
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 127d08c..3ad1bcf 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -560,7 +560,7 @@
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);
}