[Qemu-devel] [PATCH] bdrv_inc_in_flight and bdrv_dec_in_flight:

[Zhengui Li]

Avoid empty pointer access if the bs is NULL.

Signed-off-by: Zhengui Li <address@hidden>
---
 block/io.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/block/io.c b/block/io.c
index ed31810..b12d7cf 100644
--- a/block/io.c
+++ b/block/io.c
@@ -492,7 +492,9 @@ static bool tracked_request_overlaps(BdrvTrackedRequest 
*req,
 
 void bdrv_inc_in_flight(BlockDriverState *bs)
 {
-    atomic_inc(&bs->in_flight);
+    if (bs) {
+        atomic_inc(&bs->in_flight);
+    }
 }
 
 static void dummy_bh_cb(void *opaque)
@@ -508,8 +510,10 @@ void bdrv_wakeup(BlockDriverState *bs)
 
 void bdrv_dec_in_flight(BlockDriverState *bs)
 {
-    atomic_dec(&bs->in_flight);
-    bdrv_wakeup(bs);
+    if (bs) {
+        atomic_dec(&bs->in_flight);
+        bdrv_wakeup(bs);
+    }
 }
 
 static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self)
-- 
1.8.3.1