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admin: Use the newly introduced close callback handling helpers

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Use the newly introduced close callback helpers to make the code look just a
bit cleaner and more importantly, to fix the following memleak regarding a
dangling virAdmConnect object reference caused by assigning NULL to the close
callback data once the catch-disconnect routine used the callback followed
by a comparison of NULL to the originally defined close callback (which at that
moment had already been NULL'd by remoteAdminClientCloseFunc) in
virAdmConnectCloseCallbackUnregister.

717 (88 direct, 629 indirect) bytes in 1 blocks are definitely lost record
 110 of 141
    at 0x4C2A988: calloc (vg_replace_malloc.c:711)
    by 0x530696F: virAllocVar (viralloc.c:560)
    by 0x53689E6: virObjectNew (virobject.c:193)
    by 0x5368B5E: virObjectLockableNew (virobject.c:219)
    by 0x4E3E7EE: virAdmConnectNew (datatypes.c:900)
    by 0x4E398BB: virAdmConnectOpen (libvirt-admin.c:220)
    by 0x10D3E3: vshAdmConnect (virt-admin.c:161)
    by 0x10D624: vshAdmReconnect (virt-admin.c:215)
    by 0x10DB0A: cmdConnect (virt-admin.c:353)
    by 0x11288F: vshCommandRun (vsh.c:1313)
    by 0x10FDB6: main (virt-admin.c:1439)

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1357358

Signed-off-by: Erik Skultety <eskultet@redhat.com>
This commit is contained in:
Erik Skultety 2016-11-10 13:21:29 +01:00
parent 7cea74a3b2
commit e555ed6f7b
3 changed files with 3 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/admin/admin_remote.c
View File

@ -144,11 +144,7 @@ remoteAdminClientCloseFunc(virNetClientPtr client ATTRIBUTE_UNUSED,
VIR_DEBUG("Triggering connection close callback %p reason=%d, opaque=%p",
cbdata->callback, reason, cbdata->opaque);
cbdata->callback(cbdata->conn, reason, cbdata->opaque);
if (cbdata->freeCallback)
cbdata->freeCallback(cbdata->opaque);
cbdata->callback = NULL;
cbdata->freeCallback = NULL;
virAdmConnectCloseCallbackDataReset(cbdata);
}
virObjectUnlock(cbdata);
}

5
src/datatypes.c
View File

@ -928,10 +928,7 @@ virAdmConnectCloseCallbackDataDispose(void *obj)
virAdmConnectCloseCallbackDataPtr cb_data = obj;
virObjectLock(cb_data);
if (cb_data->freeCallback)
cb_data->freeCallback(cb_data->opaque);
virAdmConnectCloseCallbackDataReset(cb_data);
virObjectUnlock(cb_data);
}

18
src/libvirt-admin.c
View File

@ -513,29 +513,13 @@ int virAdmConnectUnregisterCloseCallback(virAdmConnectPtr conn,
virResetLastError();
virCheckAdmConnectReturn(conn, -1);
virObjectLock(conn->closeCallback);
virCheckNonNullArgGoto(cb, error);
if (conn->closeCallback->callback != cb) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("A different callback was requested"));
if (virAdmConnectCloseCallbackDataUnregister(conn->closeCallback, cb) < 0)
goto error;
}
conn->closeCallback->callback = NULL;
if (conn->closeCallback->freeCallback)
conn->closeCallback->freeCallback(conn->closeCallback->opaque);
conn->closeCallback->freeCallback = NULL;
virObjectUnlock(conn->closeCallback);
virObjectUnref(conn);
return 0;
error:
virObjectUnlock(conn->closeCallback);
virDispatchError(NULL);
return -1;
}