[libvirt] [PATCH 1/2] qemu: Fix possible NULL deref in qemuDomainGetResctrlMonData

[John Ferlan]

If virQEMUDriverGetCapabilities returns NULL, then a subsequent
deref of @caps would cause an error, so we just return failure.

Found by Coverity

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/qemu/qemu_driver.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index f1983f33e6..ff83d1c024 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -20728,7 +20728,8 @@ qemuDomainGetResctrlMonData(virQEMUDriverPtr driver,
     size_t i = 0;
     size_t j = 0;
 
-    caps = virQEMUDriverGetCapabilities(driver, false);
+    if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
+        return -1;
 
     switch (tag) {
     case VIR_RESCTRL_MONITOR_TYPE_CACHE:
-- 
2.20.1