[PATCH v2 2/2] qemu-img: free memory before re-assign

[Pan Nengyuan]

collect_image_check() is called twice in img_check(), the filename/format will 
be alloced without free the original memory.
It is not a big deal since the process will exit anyway, but seems like a clean 
code and it will remove the warning spotted by asan.

Reported-by: Euler Robot <address@hidden>
Signed-off-by: Pan Nengyuan <address@hidden>
---
v2->v1:
- Instead of freeing part of props in collect_image_check(), do discard the old 
check object and allocate a new one in the caller to make more sense.(suggested 
by Max Reitz)
---
 qemu-img.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/qemu-img.c b/qemu-img.c
index 804630a368..a824b8576a 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -817,6 +817,8 @@ static int img_check(int argc, char **argv)
                     check->corruptions_fixed);
         }
 
+        qapi_free_ImageCheck(check);
+        check = g_new0(ImageCheck, 1);
         ret = collect_image_check(bs, check, filename, fmt, 0);
 
         check->leaks_fixed          = leaks_fixed;
-- 
2.18.2