On Thu, Jul 19, 2012 at 04:31:38PM +0900, Simon Horman wrote:
> On Thu, Jul 05, 2012 at 11:12:29PM -0700, Ben Pfaff wrote:
> > OpenFlow headers are not as uniform as they could be, with size, alignment,
> > and numbering changes from one version to another and across varieties
> > (e.g. ordinary messages vs. "stats" messages). Until now the Open vSwitch
> > internal APIs haven't done a good job of abstracting those differences in
> > header formats. This commit changes that; from this commit forward very
> > little code actually needs to understand the header format or numbering.
> > Instead, it can just encode or decode, or pull or put, the header using
> > a more abstract API using the ofpraw_, ofptype_, and other APIs in the
> > new ofp-msgs module.
> >
> > Signed-off-by: Ben Pfaff <b...@nicira.com>
...
> > @@ -620,18 +608,21 @@ fetch_port_by_stats(const char *vconn_name,
> > run(vconn_recv_block(vconn, &reply), "OpenFlow packet receive
> > failed");
> > recv_xid = ((struct ofp_header *) reply->data)->xid;
> > if (send_xid == recv_xid) {
> > - const struct ofputil_msg_type *type;
> > - struct ofp_stats_msg *osm;
> > -
> > - ofputil_decode_msg_type(reply->data, &type);
> > - if (ofputil_msg_type_code(type) !=
> > OFPUTIL_OFPST_PORT_DESC_REPLY) {
> > + struct ofp_header *oh;
> > + enum ofptype type;
> > + struct ofpbuf b;
> > + uint16_t flags;
> > +
> > + ofpbuf_use_const(&b, oh, ntohs(oh->length));
>
> gcc tells me that oh is used uninitialised here and that does seem
> to be the case to me too.
>
> Should it be initialised to ((struct ofp_header *) reply->data) ?
Thanks. I folded this in:
diff --git a/utilities/ovs-ofctl.c b/utilities/ovs-ofctl.c
index 425448e..aa91074 100644
--- a/utilities/ovs-ofctl.c
+++ b/utilities/ovs-ofctl.c
@@ -608,7 +608,7 @@ fetch_port_by_stats(const char *vconn_name,
run(vconn_recv_block(vconn, &reply), "OpenFlow packet receive failed");
recv_xid = ((struct ofp_header *) reply->data)->xid;
if (send_xid == recv_xid) {
- struct ofp_header *oh;
+ struct ofp_header *oh = reply->data;
enum ofptype type;
struct ofpbuf b;
uint16_t flags;
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