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: 626d16f50f39 ("sctp: export some apis or variables for sctp_diag and
reuse some for proc")
Signed-off-by: Xin Long <lucien....@gmail.com>
---
net/sctp/socket.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 30aa0a5..3a8318e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -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))
--
2.1.0
