[PATCH 3.14 137/140] net_sched: fix an oops in tcindex filter

Greg Kroah-Hartman
2014-05-29T05:04:45Z

From: Cong Wang <xiyou.wangcong@gmail.com>

[ Upstream commit bf63ac73b3e132e6bf0c8798aba7b277c3316e19 ]

Kelly reported the following crash:

IP: [<ffffffff817a993d>] tcf_action_exec+0x46/0x90
PGD 3009067 PUD 300c067 PMD 11ff30067 PTE 800000011634b060
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
CPU: 1 PID: 639 Comm: dhclient Not tainted 3.15.0-rc4+ #342
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
task: ffff8801169ecd00 ti: ffff8800d21b8000 task.ti: ffff8800d21b8000
RIP: 0010:[<ffffffff817a993d>] [<ffffffff817a993d>] tcf_action_exec+0x46/0x90
RSP: 0018:ffff8800d21b9b90 EFLAGS: 00010283
RAX: 00000000ffffffff RBX: ffff88011634b8e8 RCX: ffff8800cf7133d8
RDX: ffff88011634b900 RSI: ffff8800cf7133e0 RDI: ffff8800d210f840
RBP: ffff8800d21b9bb0 R08: ffffffff8287bf60 R09: 0000000000000001
R10: ffff8800d2b22b24 R11: 0000000000000001 R12: ffff8800d210f840
R13: ffff8800d21b9c50 R14: ffff8800cf7133e0 R15: ffff8800cad433d8
FS: 00007f49723e1840(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88011634b8f0 CR3: 00000000ce469000 CR4: 00000000000006e0
Stack:
ffff8800d2170188 ffff8800d210f840 ffff8800d2171b90 0000000000000000
ffff8800d21b9be8 ffffffff817c55bb ffff8800d21b9c50 ffff8800d2171b90
ffff8800d210f840 ffff8800d21b0300 ffff8800d21b9c50 ffff8800d21b9c18
Call Trace:
[<ffffffff817c55bb>] tcindex_classify+0x88/0x9b
[<ffffffff817a7f7d>] tc_classify_compat+0x3e/0x7b
[<ffffffff817a7fdf>] tc_classify+0x25/0x9f
[<ffffffff817b0e68>] htb_enqueue+0x55/0x27a
[<ffffffff817b6c2e>] dsmark_enqueue+0x165/0x1a4
[<ffffffff81775642>] __dev_queue_xmit+0x35e/0x536
[<ffffffff8177582a>] dev_queue_xmit+0x10/0x12
[<ffffffff818f8ecd>] packet_sendmsg+0xb26/0xb9a
[<ffffffff810b1507>] ? __lock_acquire+0x3ae/0xdf3
[<ffffffff8175cf08>] __sock_sendmsg_nosec+0x25/0x27
[<ffffffff8175d916>] sock_aio_write+0xd0/0xe7
[<ffffffff8117d6b8>] do_sync_write+0x59/0x78
[<ffffffff8117d84d>] vfs_write+0xb5/0x10a
[<ffffffff8117d96a>] SyS_write+0x49/0x7f
[<ffffffff8198e212>] system_call_fastpath+0x16/0x1b

This is because we memcpy struct tcindex_filter_result which contains
struct tcf_exts, obviously struct list_head can not be simply copied.
This is a regression introduced by commit 33be627159913b094bb578
(net_sched: act: use standard struct list_head).

It's not very easy to fix it as the code is a mess:

if (old_r)
memcpy(&cr, r, sizeof(cr));
else {
memset(&cr, 0, sizeof(cr));
tcf_exts_init(&cr.exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
}
...
tcf_exts_change(tp, &cr.exts, &e);
...
memcpy(r, &cr, sizeof(cr));

the above code should equal to:

tcindex_filter_result_init(&cr);
if (old_r)
cr.res = r->res;
...
if (old_r)
tcf_exts_change(tp, &r->exts, &e);
else
tcf_exts_change(tp, &cr.exts, &e);
...
r->res = cr.res;

after this change, since there is no need to copy struct tcf_exts.

And it also fixes other places zero'ing struct's contains struct tcf_exts.

Fixes: commit 33be627159913b0 (net_sched: act: use standard struct list_head)
Reported-by: Kelly Anderson <kelly@xilka.com>
Tested-by: Kelly Anderson <kelly@xilka.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sched/cls_tcindex.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)

--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -188,6 +188,12 @@ static const struct nla_policy tcindex_p
[TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
};

+static void tcindex_filter_result_init(struct tcindex_filter_result *r)
+{
+ memset(r, 0, sizeof(*r));
+ tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
+}
+
static int
tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
u32 handle, struct tcindex_data *p,
@@ -207,15 +213,11 @@ tcindex_set_parms(struct net *net, struc
return err;

memcpy(&cp, p, sizeof(cp));
- memset(&new_filter_result, 0, sizeof(new_filter_result));
- tcf_exts_init(&new_filter_result.exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
+ tcindex_filter_result_init(&new_filter_result);

+ tcindex_filter_result_init(&cr);
if (old_r)
- memcpy(&cr, r, sizeof(cr));
- else {
- memset(&cr, 0, sizeof(cr));
- tcf_exts_init(&cr.exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
- }
+ cr.res = r->res;

if (tb[TCA_TCINDEX_HASH])
cp.hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
@@ -267,9 +269,14 @@ tcindex_set_parms(struct net *net, struc
err = -ENOMEM;
if (!cp.perfect && !cp.h) {
if (valid_perfect_hash(&cp)) {
+ int i;
+
cp.perfect = kcalloc(cp.hash, sizeof(*r), GFP_KERNEL);
if (!cp.perfect)
goto errout;
+ for (i = 0; i < cp.hash; i++)
+ tcf_exts_init(&cp.perfect[i].exts, TCA_TCINDEX_ACT,
+ TCA_TCINDEX_POLICE);
balloc = 1;
} else {
cp.h = kcalloc(cp.hash, sizeof(f), GFP_KERNEL);
@@ -295,14 +302,17 @@ tcindex_set_parms(struct net *net, struc
tcf_bind_filter(tp, &cr.res, base);
}

- tcf_exts_change(tp, &cr.exts, &e);
+ if (old_r)
+ tcf_exts_change(tp, &r->exts, &e);
+ else
+ tcf_exts_change(tp, &cr.exts, &e);

tcf_tree_lock(tp);
if (old_r && old_r != r)
- memset(old_r, 0, sizeof(*old_r));
+ tcindex_filter_result_init(old_r);

memcpy(p, &cp, sizeof(cp));
- memcpy(r, &cr, sizeof(cr));
+ r->res = cr.res;

if (r == &new_filter_result) {
struct tcindex_filter **fp;