[PATCH] virshFindDisk: fix NULL-dereference of xmlCopyNode() result

[Anastasia Belova]

xmlCopyNode() may return NULL. Add a check and log an error
in this case.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Fixes: 22766a1a53 ("virshFindDisk: Sanitize use of 'tmp' variable")
Signed-off-by: Anastasia Belova <abel...@astralinux.ru>
---
 tools/virsh-domain.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 7253596f4a..8752294784 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -12875,6 +12875,10 @@ virshFindDisk(const char *doc,
             STREQ_NULLABLE(sourceDir, path) ||
             STREQ_NULLABLE(sourceName, path)) {
             xmlNodePtr ret = xmlCopyNode(nodes[i], 1);
+            if (!ret) {
+                vshError(NULL, "%s", _("Failed to copy node"));
+                return NULL;
+            }
             /* drop backing store since they are not needed here */
             virshDiskDropBackingStore(ret);
             return ret;
-- 
2.43.0