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tipc: fix unbalanced reference counter 

When a topology subscription is created, we may encounter (or KASAN
may provoke) a failure to create a corresponding service instance in
the binding table. Instead of letting the tipc_nametbl_subscribe()
report the failure back to the caller, the function just makes a warning
printout and returns, without incrementing the subscription reference
counter as expected by the caller.

This makes the caller believe that the subscription was successful, so
it will at a later moment try to unsubscribe the item. This involves
a sub_put() call. Since the reference counter never was incremented
in the first place, we get a premature delete of the subscription item,
followed by a "use-after-free" warning.

We fix this by adding a return value to tipc_nametbl_subscribe() and
make the caller aware of the failure to subscribe.

This bug seems to always have been around, but this fix only applies
back to the commit shown below. Given the low risk of this happening
we believe this to be sufficient.

Fixes: commit 218527fe27 ("tipc: replace name table service range
array with rb tree")
Reported-by: syzbot+aa245f26d42b8305d157@syzkaller.appspotmail.com

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2018-04-11 22:52:09 +02:00 committed by David S. Miller
parent 1c2734b31d
commit c3317f4db8
3 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/tipc/name_table.c
View File

@ -665,13 +665,14 @@ int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower,
/**
* tipc_nametbl_subscribe - add a subscription object to the name table
*/
void tipc_nametbl_subscribe(struct tipc_subscription *sub)
bool tipc_nametbl_subscribe(struct tipc_subscription *sub)
{
struct name_table *nt = tipc_name_table(sub->net);
struct tipc_net *tn = tipc_net(sub->net);
struct tipc_subscr *s = &sub->evt.s;
u32 type = tipc_sub_read(s, seq.type);
struct tipc_service *sc;
bool res = true;
spin_lock_bh(&tn->nametbl_lock);
sc = tipc_service_find(sub->net, type);
@ -685,8 +686,10 @@ void tipc_nametbl_subscribe(struct tipc_subscription *sub)
pr_warn("Failed to subscribe for {%u,%u,%u}\n", type,
tipc_sub_read(s, seq.lower),
tipc_sub_read(s, seq.upper));
res = false;
}
spin_unlock_bh(&tn->nametbl_lock);
return res;
}
/**

2
net/tipc/name_table.h
View File

@ -126,7 +126,7 @@ struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
u32 lower, u32 upper,
u32 node, u32 key);
void tipc_nametbl_subscribe(struct tipc_subscription *s);
bool tipc_nametbl_subscribe(struct tipc_subscription *s);
void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
int tipc_nametbl_init(struct net *net);
void tipc_nametbl_stop(struct net *net);

5
net/tipc/subscr.c
View File

@ -153,7 +153,10 @@ struct tipc_subscription *tipc_sub_subscribe(struct net *net,
memcpy(&sub->evt.s, s, sizeof(*s));
spin_lock_init(&sub->lock);
kref_init(&sub->kref);
tipc_nametbl_subscribe(sub);
if (!tipc_nametbl_subscribe(sub)) {
kfree(sub);
return NULL;
}
timer_setup(&sub->timer, tipc_sub_timeout, 0);
timeout = tipc_sub_read(&sub->evt.s, timeout);
if (timeout != TIPC_WAIT_FOREVER)