[PATCH] block/monitor/block-hmp-cmds.c: Fix crash when execute hmp_commit

[wangliangzz@126.com]

From: Wang Liang <wangliangzz@inspur.com>

We need to get the aio_context before calling the blk_is_available.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1615
Signed-off-by: Wang Liang <wangliangzz@inspur.com>
---
 block/monitor/block-hmp-cmds.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c
index 2846083546..ca2599de44 100644
--- a/block/monitor/block-hmp-cmds.c
+++ b/block/monitor/block-hmp-cmds.c
@@ -214,15 +214,17 @@ void hmp_commit(Monitor *mon, const QDict *qdict)
             error_report("Device '%s' not found", device);
             return;
         }
-        if (!blk_is_available(blk)) {
-            error_report("Device '%s' has no medium", device);
-            return;
-        }
 
         bs = bdrv_skip_implicit_filters(blk_bs(blk));
         aio_context = bdrv_get_aio_context(bs);
         aio_context_acquire(aio_context);
 
+        if (!blk_is_available(blk)) {
+            error_report("Device '%s' has no medium", device);
+            aio_context_release(aio_context);
+            return;
+        }
+
         ret = bdrv_commit(bs);
 
         aio_context_release(aio_context);
-- 
2.27.0