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sctp: return next obj by passing pos + 1 into sctp_transport_get_idx 

In sctp_for_each_transport, pos is used to save how many objs it has
dumped. Now it gets the last obj by sctp_transport_get_idx, then gets
the next obj by sctp_transport_get_next.

The issue is that in the meanwhile if some objs in transport hashtable
are removed and the objs nums are less than pos, sctp_transport_get_idx
would return NULL and hti.walker.tbl is NULL as well. At this moment
it should stop hti, instead of continue getting the next obj. Or it
would cause a NULL pointer dereference in sctp_transport_get_next.

This patch is to pass pos + 1 into sctp_transport_get_idx to get the
next obj directly, even if pos > objs nums, it would return NULL and
stop hti.

Fixes: 626d16f50f ("sctp: export some apis or variables for sctp_diag and reuse some for proc")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-06-15 17:49:08 +08:00 committed by David S. Miller
parent 5f2f97656a
commit 988c732211
1 changed files with 2 additions and 3 deletions
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5
net/sctp/socket.c
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@ -4666,9 +4666,8 @@ int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
if (err)
return err;
sctp_transport_get_idx(net, &hti, pos);
obj = sctp_transport_get_next(net, &hti);
for (; obj && !IS_ERR(obj); obj = sctp_transport_get_next(net, &hti)) {
obj = sctp_transport_get_idx(net, &hti, pos + 1);
for (; !IS_ERR_OR_NULL(obj); obj = sctp_transport_get_next(net, &hti)) {
struct sctp_transport *transport = obj;
if (!sctp_transport_hold(transport))