[PATCH for-4.15 4/5] tools/xenstore-control: Don't leak buf in live_update_start()

[Julien Grall]

From: Julien Grall <jgr...@amazon.com>

All the error paths but one will free buf. Cover the remaining path so
buf can't be leaked.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Fixes: 7f97193e6aa8 ("tools/xenstore: add live update command to 
xenstore-control")
Signed-off-by: Julien Grall <jgr...@amazon.com>
---
 tools/xenstore/xenstore_control.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/xenstore/xenstore_control.c 
b/tools/xenstore/xenstore_control.c
index f6f4626c0656..548363ee7094 100644
--- a/tools/xenstore/xenstore_control.c
+++ b/tools/xenstore/xenstore_control.c
@@ -44,8 +44,10 @@ static int live_update_start(struct xs_handle *xsh, bool 
force, unsigned int to)
         return 1;
 
     ret = strdup("BUSY");
-    if (!ret)
+    if (!ret) {
+        free(buf);
         return 1;
+    }
 
     for (time_start = time(NULL); time(NULL) - time_start < to;) {
         free(ret);
-- 
2.17.1