[Qemu-devel] [PATCH v4 19/37] rbd: Fix use after free in qemu_rbd_set_keypairs() error path

[Kevin Wolf]

If we want to include the invalid option name in the error message, we
can't free the string earlier than that.

Cc: qemu-sta...@nongnu.org
Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
---
 block/rbd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/rbd.c b/block/rbd.c
index c1275c1ec9..c1025c8493 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -268,13 +268,14 @@ static int qemu_rbd_set_keypairs(rados_t cluster, const 
char *keypairs_json,
         key = qstring_get_str(name);
 
         ret = rados_conf_set(cluster, key, qstring_get_str(value));
-        QDECREF(name);
         QDECREF(value);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "invalid conf option %s", key);
+            QDECREF(name);
             ret = -EINVAL;
             break;
         }
+        QDECREF(name);
     }
 
     QDECREF(keypairs);
-- 
2.13.6