[Devel] [PATCH RHEL7 COMMIT] net: sched: sch_teql: fix null-pointer dereference

[Vasily Averin]

The commit is pushed to "branch-rh7-3.10.0-1160.25.1.vz7.180.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.25.1.vz7.180.2
------>
commit 6bbe12d5e00398dc87e8fd87dab64d9804d8f7aa
Author: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
Date:   Mon May 17 14:21:52 2021 +0300

    net: sched: sch_teql: fix null-pointer dereference
    
    Reproduce:
    
      modprobe sch_teql
      tc qdisc add dev teql0 root teql0
    
    This leads to (for instance in Centos 7 VM) OOPS:
    
    [  532.366633] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8
    [  532.366733] IP: [<ffffffffc06124a8>] teql_destroy+0x18/0x100 [sch_teql]
    [  532.366825] PGD 80000001376d5067 PUD 137e37067 PMD 0
    [  532.366906] Oops: 0000 [#1] SMP
    [  532.366987] Modules linked in: sch_teql ...
    [  532.367945] CPU: 1 PID: 3026 Comm: tc Kdump: loaded Tainted: G               ------------ T 3.10.0-1062.7.1.el7.x86_64 #1
    [  532.368041] Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.2 04/01/2014
    [  532.368125] task: ffff8b7d37d31070 ti: ffff8b7c9fdbc000 task.ti: ffff8b7c9fdbc000
    [  532.368224] RIP: 0010:[<ffffffffc06124a8>]  [<ffffffffc06124a8>] teql_destroy+0x18/0x100 [sch_teql]
    [  532.368320] RSP: 0018:ffff8b7c9fdbf8e0  EFLAGS: 00010286
    [  532.368394] RAX: ffffffffc0612490 RBX: ffff8b7cb1565e00 RCX: ffff8b7d35ba2000
    [  532.368476] RDX: ffff8b7d35ba2000 RSI: 0000000000000000 RDI: ffff8b7cb1565e00
    [  532.368557] RBP: ffff8b7c9fdbf8f8 R08: ffff8b7d3fd1f140 R09: ffff8b7d3b001600
    [  532.368638] R10: ffff8b7d3b001600 R11: ffffffff84c7d65b R12: 00000000ffffffd8
    [  532.368719] R13: 0000000000008000 R14: ffff8b7d35ba2000 R15: ffff8b7c9fdbf9a8
    [  532.368800] FS:  00007f6a4e872740(0000) GS:ffff8b7d3fd00000(0000) knlGS:0000000000000000
    [  532.368885] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  532.368961] CR2: 00000000000000a8 CR3: 00000001396ee000 CR4: 00000000000206e0
    [  532.369046] Call Trace:
    [  532.369159]  [<ffffffff84c8192e>] qdisc_create+0x36e/0x450
    [  532.369268]  [<ffffffff846a9b49>] ? ns_capable+0x29/0x50
    [  532.369366]  [<ffffffff849afde2>] ? nla_parse+0x32/0x120
    [  532.369442]  [<ffffffff84c81b4c>] tc_modify_qdisc+0x13c/0x610
    [  532.371508]  [<ffffffff84c693e7>] rtnetlink_rcv_msg+0xa7/0x260
    [  532.372668]  [<ffffffff84907b65>] ? sock_has_perm+0x75/0x90
    [  532.373790]  [<ffffffff84c69340>] ? rtnl_newlink+0x890/0x890
    [  532.374914]  [<ffffffff84c8da7b>] netlink_rcv_skb+0xab/0xc0
    [  532.376055]  [<ffffffff84c63708>] rtnetlink_rcv+0x28/0x30
    [  532.377204]  [<ffffffff84c8d400>] netlink_unicast+0x170/0x210
    [  532.378333]  [<ffffffff84c8d7a8>] netlink_sendmsg+0x308/0x420
    [  532.379465]  [<ffffffff84c2f3a6>] sock_sendmsg+0xb6/0xf0
    [  532.380710]  [<ffffffffc034a56e>] ? __xfs_filemap_fault+0x8e/0x1d0 [xfs]
    [  532.381868]  [<ffffffffc034a75c>] ? xfs_filemap_fault+0x2c/0x30 [xfs]
    [  532.383037]  [<ffffffff847ec23a>] ? __do_fault.isra.61+0x8a/0x100
    [  532.384144]  [<ffffffff84c30269>] ___sys_sendmsg+0x3e9/0x400
    [  532.385268]  [<ffffffff847f3fad>] ? handle_mm_fault+0x39d/0x9b0
    [  532.386387]  [<ffffffff84d88678>] ? __do_page_fault+0x238/0x500
    [  532.387472]  [<ffffffff84c31921>] __sys_sendmsg+0x51/0x90
    [  532.388560]  [<ffffffff84c31972>] SyS_sendmsg+0x12/0x20
    [  532.389636]  [<ffffffff84d8dede>] system_call_fastpath+0x25/0x2a
    [  532.390704]  [<ffffffff84d8de21>] ? system_call_after_swapgs+0xae/0x146
    [  532.391753] Code: 00 00 00 00 00 00 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 e5 41 55 41 54 53 48 8b b7 48 01 00 00 48 89 fb <48> 8b 8e a8 00 00 00 48 85 c9 74 43 48 89 ca eb 0f 0f 1f 80 00
    [  532.394036] RIP  [<ffffffffc06124a8>] teql_destroy+0x18/0x100 [sch_teql]
    [  532.395127]  RSP <ffff8b7c9fdbf8e0>
    [  532.396179] CR2: 00000000000000a8
    
    Null pointer dereference happens on master->slaves dereference in
    teql_destroy() as master is null-pointer.
    
    When qdisc_create() calls teql_qdisc_init() it imediately fails after
    check "if (m->dev == dev)" because both devices are teql0, and it does
    not set qdisc_priv(sch)->m leaving it zero on error path, then
    qdisc_create() imediately calls teql_destroy() which does not expect
    zero master pointer and we get OOPS.
    
    https://jira.sw.ru/browse/PSBM-128205
    
    Fixes: 9041080 ("net/teql: disable "True" (or "trivial") link equalizer inside a CT")
    Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 net/sched/sch_teql.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index 497348cf9b73..6ea198b5efba 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -138,6 +138,9 @@ teql_destroy(struct Qdisc *sch)
 	struct teql_sched_data *dat = qdisc_priv(sch);
 	struct teql_master *master = dat->m;
 
+	if (!master)
+		return;
+
 	prev = master->slaves;
 	if (prev) {
 		do {