[libvirt] [PATCH 5/3] qemu: Resolve Coverity RESOURCE_LEAK

[John Ferlan]

Recent changes to the -M/--machine processing code in qemuParseCommandLine
caused Coverity to determine there was a possible resource leak with how
the 'list' is managed. Rather than try to add virStringFreeList calls
everywhere - just promote list to the top of the variables and free it
within the error processing code. Also required a couple of other tweaks
in order to avoid double free's.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/qemu/qemu_command.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3ccd35d..411b7a4 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -12382,6 +12382,7 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
     size_t i;
     bool nographics = false;
     bool fullscreen = false;
+    char **list = NULL;
     char *path;
     size_t nnics = 0;
     const char **nics = NULL;
@@ -12849,7 +12850,6 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
                 VIR_FREE(def->name);
         } else if (STREQ(arg, "-M") ||
                    STREQ(arg, "-machine")) {
-            char **list;
             char *param;
             size_t j = 0;
 
@@ -12864,10 +12864,8 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
             if (STRPREFIX(param, "type="))
                 param += strlen("type=");
             if (!strchr(param, '=')) {
-                if (VIR_STRDUP(def->os.machine, param) < 0) {
-                    virStringFreeList(list);
+                if (VIR_STRDUP(def->os.machine, param) < 0)
                     goto error;
-                }
                 j++;
             }
 
@@ -12912,6 +12910,7 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
                 }
             }
             virStringFreeList(list);
+            list = NULL;
         } else if (STREQ(arg, "-serial")) {
             WANT_VALUE();
             if (STRNEQ(val, "none")) {
@@ -13385,6 +13384,7 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
     virDomainDiskDefFree(disk);
     qemuDomainCmdlineDefFree(cmd);
     virDomainDefFree(def);
+    virStringFreeList(list);
     VIR_FREE(nics);
     if (monConfig) {
         virDomainChrSourceDefFree(*monConfig);
-- 
2.1.0