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authorJon Maloy <jon.maloy@ericsson.com>2018-04-03 19:11:19 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-04 11:33:52 -0400
commitb714295abc59cfa2fe46f9341503d9a7eb790503 (patch)
tree79ccd9dcbd8e0faac72c82cb718139d34a9f1511 /net/tipc/subscr.c
parentf51ffde9276e94fd4608dd7f5c6798fac41bb065 (diff)
downloadlinux-b714295abc59cfa2fe46f9341503d9a7eb790503.tar.bz2
tipc: Fix missing list initializations in struct tipc_subscription
When an item of struct tipc_subscription is created, we fail to initialize the two lists aggregated into the struct. This has so far never been a problem, since the items are just added to a root object by list_add(), which does not require the addee list to be pre-initialized. However, syzbot is provoking situations where this addition fails, whereupon the attempted removal if the item from the list causes a crash. This problem seems to always have been around, despite that the code for creating this object was rewritten in commit 242e82cc95f6 ("tipc: collapse subscription creation functions"), which is still in net-next. We fix this for that commit by initializing the two lists properly. Fixes: 242e82cc95f6 ("tipc: collapse subscription creation functions") Reported-by: syzbot+0bb443b74ce09197e970@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/subscr.c')
-rw-r--r--net/tipc/subscr.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 6925a989569b..b7d80bc5f4ab 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -145,6 +145,8 @@ struct tipc_subscription *tipc_sub_subscribe(struct net *net,
pr_warn("Subscription rejected, no memory\n");
return NULL;
}
+ INIT_LIST_HEAD(&sub->service_list);
+ INIT_LIST_HEAD(&sub->sub_list);
sub->net = net;
sub->conid = conid;
sub->inactive = false;