virshFindDisk: fix NULL-dereference of xmlCopyNode() result

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 <abelova@astralinux.ru>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 7253596f4ac8ac95f398554055995b46dddefdef..6e18d195e6d1c2e073f074c668168c33a7aee359 100644 (file)
--- 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 XML node"));
+                return NULL;
+            }
             /* drop backing store since they are not needed here */
             virshDiskDropBackingStore(ret);
             return ret;