ipmr: dont corrupt lists
ipmr_rules_exit() and ip6mr_rules_exit() free a list of items, but
forget to properly remove these items from list. List head is not
changed and still points to freed memory.
This can trigger a fault later when icmpv6_sk_exit() is called.
Fix is to either reinit list, or use list_del() to properly remove items
from list before freeing them.
bugzilla report : https://bugzilla.kernel.org/show_bug.cgi?id=16120
Introduced by commit d1db275dd3f6e4 (ipv6: ip6mr: support multiple
tables) and commit f0ad0860d01e (ipv4: ipmr: support multiple tables)
Reported-by: Alex Zhavnerchik <alex.vizor@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 856123f..757f25eb 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -267,8 +267,10 @@
{
struct mr_table *mrt, *next;
- list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list)
+ list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
+ list_del(&mrt->list);
kfree(mrt);
+ }
fib_rules_unregister(net->ipv4.mr_rules_ops);
}
#else