diff options
| author | Jiri Pirko | 2017-09-13 17:32:37 +0200 |
|---|---|---|
| committer | David S. Miller | 2017-09-13 09:34:08 -0700 |
| commit | 255cd50f207ae8ec7b22663246c833407744e634 (patch) | |
| tree | 8c98c50e192e780bfa9d845b4c7e416cb3ae9d3a /kernel/taskstats.c | |
| parent | 822f8565c93949fb2d31502d595c8bc45629c9b7 (diff) | |
net: sched: fix use-after-free in tcf_action_destroy and tcf_del_walker
Recent commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu") removed
freeing in call_rcu, which changed already existing hard-to-hit
race condition into 100% hit:
[ 598.599825] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 598.607782] IP: tcf_action_destroy+0xc0/0x140
Or:
[ 40.858924] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 40.862840] IP: tcf_generic_walker+0x534/0x820
Fix this by storing the ops and use them directly for module_put call.
Fixes: a85a970af265 ("net_sched: move tc_action into tcf_common")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/taskstats.c')
0 files changed, 0 insertions, 0 deletions