[libvirt] [PATCH] Fix several memory leaks
Daniel P. Berrange
berrange at redhat.com
Tue Sep 1 10:49:22 UTC 2009
On Tue, Sep 01, 2009 at 01:50:50AM +0900, Ryota Ozaki wrote:
> index df275e6..17ba44a 100644
> --- a/qemud/qemud.c
> +++ b/qemud/qemud.c
> @@ -1733,7 +1733,7 @@ readmore:
>
> /* Possibly need to create another receive buffer */
> if ((client->nrequests < max_client_requests &&
> - VIR_ALLOC(client->rx) < 0)) {
> + !client->rx && VIR_ALLOC(client->rx) < 0)) {
> qemudDispatchClientFailure(client);
> } else {
> if (client->rx)
This is not required. Although client->rx looks like a list, it will
only ever have a single entry in it. Since we have just called
qemudClientMessageQueueServe() a few lines earlier, we know that
client->rx is NULL at this point. So there is no leak by always
calling VIR_ALLOC(client->rx);
> diff --git a/src/domain_conf.c b/src/domain_conf.c
> index 1d2cc7c..4b64219 100644
> --- a/src/domain_conf.c
> +++ b/src/domain_conf.c
> @@ -4361,6 +4361,7 @@ int virDomainSaveXML(virConnectPtr conn,
> cleanup:
> if (fd != -1)
> close(fd);
> + VIR_FREE(configFile);
> return ret;
> }
>
ACK
> diff --git a/src/network_conf.c b/src/network_conf.c
> index bb649a4..58a4f32 100644
> --- a/src/network_conf.c
> +++ b/src/network_conf.c
> @@ -820,6 +820,7 @@ int virNetworkDeleteConfig(virConnectPtr conn,
> {
> char *configFile = NULL;
> char *autostartLink = NULL;
> + int ret = -1;
>
> if ((configFile = virNetworkConfigFile(conn, configDir,
> net->def->name)) == NULL)
> goto error;
> @@ -836,12 +837,12 @@ int virNetworkDeleteConfig(virConnectPtr conn,
> goto error;
> }
>
> - return 0;
> + ret = 0;
>
> error:
> VIR_FREE(configFile);
> VIR_FREE(autostartLink);
> - return -1;
> + return ret;
> }
>
ACK
> char *virNetworkConfigFile(virConnectPtr conn,
> diff --git a/src/qemu_conf.c b/src/qemu_conf.c
> index 22f5edd..32d6a48 100644
> --- a/src/qemu_conf.c
> +++ b/src/qemu_conf.c
> @@ -1034,7 +1034,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
> virDomainNetDefPtr net,
> int qemuCmdFlags)
> {
> - char *brname;
> + char *brname = NULL;
> int err;
> int tapfd = -1;
> int vnet_hdr = 0;
> @@ -1053,7 +1053,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
> if (brname == NULL)
> return -1;
> } else if (net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {
> - brname = net->data.bridge.brname;
> + brname = strdup(net->data.bridge.brname);
> } else {
> qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
> _("Network type %d is not supported"), net->type);
> @@ -1063,7 +1063,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
> if (!driver->brctl && (err = brInit(&driver->brctl))) {
> virReportSystemError(conn, err, "%s",
> _("cannot initialize bridge support"));
> - return -1;
> + goto cleanup;
> }
>
> if (!net->ifname ||
> @@ -1072,7 +1072,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
> VIR_FREE(net->ifname);
> if (!(net->ifname = strdup("vnet%d"))) {
> virReportOOMError(conn);
> - return -1;
> + goto cleanup;
> }
> /* avoid exposing vnet%d in dumpxml or error outputs */
> template_ifname = 1;
> @@ -1100,9 +1100,12 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
> }
> if (template_ifname)
> VIR_FREE(net->ifname);
> - return -1;
> + tapfd = -1;
> }
>
> +cleanup:
> + VIR_FREE(brname);
> +
> return tapfd;
> }
ACK
> diff --git a/src/storage_backend_fs.c b/src/storage_backend_fs.c
> index ca6d329..222e591 100644
> --- a/src/storage_backend_fs.c
> +++ b/src/storage_backend_fs.c
> @@ -856,6 +856,8 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn,
>
> vol->type = VIR_STORAGE_VOL_FILE;
> vol->target.format = VIR_STORAGE_VOL_FILE_RAW; /* Real value
> is filled in during probe */
> + if (vol->target.path)
> + VIR_FREE(vol->target.path);
> if (virAsprintf(&vol->target.path, "%s/%s",
> pool->def->target.path,
> vol->name) == -1)
This doesn't make any sense - we just allocated 'vol' a few lines
earlier, so it can't possibly be non-NULL.
> @@ -1022,6 +1024,9 @@ virStorageBackendFileSystemVolCreate(virConnectPtr conn,
>
> vol->type = VIR_STORAGE_VOL_FILE;
>
> + if (vol->target.path)
> + VIR_FREE(vol->target.path);
> +
> if (virAsprintf(&vol->target.path, "%s/%s",
> pool->def->target.path,
> vol->name) == -1) {
THis one is possibly correct, though we would need the same for
vol->key too. Also there is no need to have 'if (xx)' before a
call to VIR_FREE - it accepts NULLs happily. 'make syntax-check'
would complain about this additional 'if'.
Regards.
Daniel
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