qemu-img: free memory before re-assign

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 <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
Message-Id: <20200227012950.12256-3-pannengyuan@huawei.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/qemu-img.c b/qemu-img.c
index 4bc40df..7b7087d 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;