[xml] Memory leaks

[Iñigo Martínez <inigomartinez gmail com>]

Hi,

I have been looking at the memory usage of my programs using libxml2 y
using valgrind, and I have seen these messages:

==22134== Invalid read of size 8
==22134==    at 0x519482F: xmlFreeNode (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x400A02: main (test-command.c:51)
==22134==  Address 0x7715ef8 is 152 bytes inside a block of size 176 free'd
==22134==    at 0x4C29730: free (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==22134==    by 0x5194391: xmlFreeDoc (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x54A4BBD: xml_msg_get_msg (xml-message.c:111)
==22134==    by 0x4009CA: main (test-command.c:44)
==22134==
==22134== Invalid read of size 8
==22134==    at 0x5194476: xmlFreeNodeList (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x519484E: xmlFreeNode (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x400A02: main (test-command.c:51)
==22134==  Address 0x7715ef8 is 152 bytes inside a block of size 176 free'd
==22134==    at 0x4C29730: free (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==22134==    by 0x5194391: xmlFreeDoc (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x54A4BBD: xml_msg_get_msg (xml-message.c:111)
==22134==    by 0x4009CA: main (test-command.c:44)
==22134==
==22134== Invalid read of size 8
==22134==    at 0x5194642: xmlFreeProp (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x5194728: xmlFreePropList (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x51945D1: xmlFreeNodeList (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x519484E: xmlFreeNode (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x400A02: main (test-command.c:51)
==22134==  Address 0x7715ef8 is 152 bytes inside a block of size 176 free'd
==22134==    at 0x4C29730: free (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==22134==    by 0x5194391: xmlFreeDoc (in
/usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1)
==22134==    by 0x54A4BBD: xml_msg_get_msg (xml-message.c:111)
==22134==    by 0x4009CA: main (test-command.c:44)

These messages correspond to this code:

xml-message.c 111

    xmlNodePtr
    xml_msg_get_msg (const char *str) {
        xmlDoc *doc;
        xmlNodePtr msg;

        if (!(doc = xmlRecoverDoc (BAD_CAST str)))
            return NULL;

        msg = xmlDocGetRootElement (doc);
        xmlUnlinkNode (msg);
        xmlFreeDoc (doc);

        return msg;
    }

test-command.c 44 and 51

    xmlNodePtr node;
    node = xml_msg_get_msg ("<Command Timestamp=\"0\"
ReceptionTimeStamp=\"0\" Sender=\"P1\"
Receiver=\"P2\"><GetData/></Command>");
    xmlFreeNode (node);

Any idea on why I'm leaking memory ?

Thank you very much,

Best regards,