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| author | Eric Dumazet <edumazet@google.com> | 2020-01-18 20:45:06 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-01-19 16:02:15 +0100 |
| commit | 09d4f10a5e78d76a53e3e584f1e6a701b6d24108 (patch) | |
| tree | e1e0c20cfafd194a43bed9f59cfacd2aca20c9f5 /net/sched | |
| parent | e02d9c4c68dc0ca08ded9487720bba775c09669b (diff) | |
| download | linux-09d4f10a5e78d76a53e3e584f1e6a701b6d24108.tar.gz linux-09d4f10a5e78d76a53e3e584f1e6a701b6d24108.tar.bz2 linux-09d4f10a5e78d76a53e3e584f1e6a701b6d24108.zip | |
net: sched: act_ctinfo: fix memory leak
Implement a cleanup method to properly free ci->params
BUG: memory leak
unreferenced object 0xffff88811746e2c0 (size 64):
comm "syz-executor617", pid 7106, jiffies 4294943055 (age 14.250s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0 34 60 84 ff ff ff ff 00 00 00 00 00 00 00 00 .4`.............
backtrace:
[<0000000015aa236f>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<0000000015aa236f>] slab_post_alloc_hook mm/slab.h:586 [inline]
[<0000000015aa236f>] slab_alloc mm/slab.c:3320 [inline]
[<0000000015aa236f>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3549
[<000000002c946bd1>] kmalloc include/linux/slab.h:556 [inline]
[<000000002c946bd1>] kzalloc include/linux/slab.h:670 [inline]
[<000000002c946bd1>] tcf_ctinfo_init+0x21a/0x530 net/sched/act_ctinfo.c:236
[<0000000086952cca>] tcf_action_init_1+0x400/0x5b0 net/sched/act_api.c:944
[<000000005ab29bf8>] tcf_action_init+0x135/0x1c0 net/sched/act_api.c:1000
[<00000000392f56f9>] tcf_action_add+0x9a/0x200 net/sched/act_api.c:1410
[<0000000088f3c5dd>] tc_ctl_action+0x14d/0x1bb net/sched/act_api.c:1465
[<000000006b39d986>] rtnetlink_rcv_msg+0x178/0x4b0 net/core/rtnetlink.c:5424
[<00000000fd6ecace>] netlink_rcv_skb+0x61/0x170 net/netlink/af_netlink.c:2477
[<0000000047493d02>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5442
[<00000000bdcf8286>] netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
[<00000000bdcf8286>] netlink_unicast+0x223/0x310 net/netlink/af_netlink.c:1328
[<00000000fc5b92d9>] netlink_sendmsg+0x2c0/0x570 net/netlink/af_netlink.c:1917
[<00000000da84d076>] sock_sendmsg_nosec net/socket.c:639 [inline]
[<00000000da84d076>] sock_sendmsg+0x54/0x70 net/socket.c:659
[<0000000042fb2eee>] ____sys_sendmsg+0x2d0/0x300 net/socket.c:2330
[<000000008f23f67e>] ___sys_sendmsg+0x8a/0xd0 net/socket.c:2384
[<00000000d838e4f6>] __sys_sendmsg+0x80/0xf0 net/socket.c:2417
[<00000000289a9cb1>] __do_sys_sendmsg net/socket.c:2426 [inline]
[<00000000289a9cb1>] __se_sys_sendmsg net/socket.c:2424 [inline]
[<00000000289a9cb1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2424
Fixes: 24ec483cec98 ("net: sched: Introduce act_ctinfo action")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Kevin 'ldir' Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Kevin 'ldir' Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/act_ctinfo.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c index 40038c321b4a..19649623493b 100644 --- a/net/sched/act_ctinfo.c +++ b/net/sched/act_ctinfo.c @@ -360,6 +360,16 @@ static int tcf_ctinfo_search(struct net *net, struct tc_action **a, u32 index) return tcf_idr_search(tn, a, index); } +static void tcf_ctinfo_cleanup(struct tc_action *a) +{ + struct tcf_ctinfo *ci = to_ctinfo(a); + struct tcf_ctinfo_params *cp; + + cp = rcu_dereference_protected(ci->params, 1); + if (cp) + kfree_rcu(cp, rcu); +} + static struct tc_action_ops act_ctinfo_ops = { .kind = "ctinfo", .id = TCA_ID_CTINFO, @@ -367,6 +377,7 @@ static struct tc_action_ops act_ctinfo_ops = { .act = tcf_ctinfo_act, .dump = tcf_ctinfo_dump, .init = tcf_ctinfo_init, + .cleanup= tcf_ctinfo_cleanup, .walk = tcf_ctinfo_walker, .lookup = tcf_ctinfo_search, .size = sizeof(struct tcf_ctinfo), |