Re: [PATCH 2/4] src: fix multiple resource leaks in loops

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On Mon, Apr 10, 2017 at 09:53:58AM +0200, Pavel Hrdina wrote:
All of the variables are filled inside a loop and therefore
needs to be also freed in every cycle.

Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
---
src/conf/node_device_conf.c | 10 +++++-----
src/conf/storage_conf.c     |  1 +
src/util/virsysinfo.c       |  2 ++
3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index 7d0baa9d1a..e21a98d51f 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -1582,7 +1582,6 @@ virNodeDeviceDefParseXML(xmlXPathContextPtr ctxt,
    for (i = 0, m = 0; i < n; i++) {
        xmlNodePtr node = nodes[i];
        char *tmp = virXMLPropString(node, "type");
-        virNodeDevDevnodeType type;
        int val;

        if (!tmp) {
@@ -1591,15 +1590,16 @@ virNodeDeviceDefParseXML(xmlXPathContextPtr ctxt,
            goto error;
        }

-        if ((val = virNodeDevDevnodeTypeFromString(tmp)) < 0) {
+        val = virNodeDevDevnodeTypeFromString(tmp);
+        VIR_FREE(tmp);
+
+        if (val < 0) {
            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                           _("unknown devnode type '%s'"), tmp);

This accesses the 'tmp' variable after it has been freed.

I suggest preserving the error message, so there will be two VIR_FREE's
needed - one for the success path and one for the error path.

Jan

-            VIR_FREE(tmp);
            goto error;
        }

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