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    Subject[PATCH 4.16 226/279] net sched actions: fix invalid pointer dereferencing if skbedit flags missing
    Date
    4.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Roman Mashak <mrv@mojatatu.com>

    [ Upstream commit af5d01842fe1fbfb9f5e1c1d957ba02ab6f4569a ]

    When application fails to pass flags in netlink TLV for a new skbedit action,
    the kernel results in the following oops:

    [ 8.307732] BUG: unable to handle kernel paging request at 0000000000021130
    [ 8.309167] PGD 80000000193d1067 P4D 80000000193d1067 PUD 180e0067 PMD 0
    [ 8.310595] Oops: 0000 [#1] SMP PTI
    [ 8.311334] Modules linked in: kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper serio_raw
    [ 8.314190] CPU: 1 PID: 397 Comm: tc Not tainted 4.17.0-rc3+ #357
    [ 8.315252] RIP: 0010:__tcf_idr_release+0x33/0x140
    [ 8.316203] RSP: 0018:ffffa0718038f840 EFLAGS: 00010246
    [ 8.317123] RAX: 0000000000000001 RBX: 0000000000021100 RCX: 0000000000000000
    [ 8.319831] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000021100
    [ 8.321181] RBP: 0000000000000000 R08: 000000000004adf8 R09: 0000000000000122
    [ 8.322645] R10: 0000000000000000 R11: ffffffff9e5b01ed R12: 0000000000000000
    [ 8.324157] R13: ffffffff9e0d3cc0 R14: 0000000000000000 R15: 0000000000000000
    [ 8.325590] FS: 00007f591292e700(0000) GS:ffff8fcf5bc40000(0000) knlGS:0000000000000000
    [ 8.327001] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 8.327987] CR2: 0000000000021130 CR3: 00000000180e6004 CR4: 00000000001606a0
    [ 8.329289] Call Trace:
    [ 8.329735] tcf_skbedit_init+0xa7/0xb0
    [ 8.330423] tcf_action_init_1+0x362/0x410
    [ 8.331139] ? try_to_wake_up+0x44/0x430
    [ 8.331817] tcf_action_init+0x103/0x190
    [ 8.332511] tc_ctl_action+0x11a/0x220
    [ 8.333174] rtnetlink_rcv_msg+0x23d/0x2e0
    [ 8.333902] ? _cond_resched+0x16/0x40
    [ 8.334569] ? __kmalloc_node_track_caller+0x5b/0x2c0
    [ 8.335440] ? rtnl_calcit.isra.31+0xf0/0xf0
    [ 8.336178] netlink_rcv_skb+0xdb/0x110
    [ 8.336855] netlink_unicast+0x167/0x220
    [ 8.337550] netlink_sendmsg+0x2a7/0x390
    [ 8.338258] sock_sendmsg+0x30/0x40
    [ 8.338865] ___sys_sendmsg+0x2c5/0x2e0
    [ 8.339531] ? pagecache_get_page+0x27/0x210
    [ 8.340271] ? filemap_fault+0xa2/0x630
    [ 8.340943] ? page_add_file_rmap+0x108/0x200
    [ 8.341732] ? alloc_set_pte+0x2aa/0x530
    [ 8.342573] ? finish_fault+0x4e/0x70
    [ 8.343332] ? __handle_mm_fault+0xbc1/0x10d0
    [ 8.344337] ? __sys_sendmsg+0x53/0x80
    [ 8.345040] __sys_sendmsg+0x53/0x80
    [ 8.345678] do_syscall_64+0x4f/0x100
    [ 8.346339] entry_SYSCALL_64_after_hwframe+0x44/0xa9
    [ 8.347206] RIP: 0033:0x7f591191da67
    [ 8.347831] RSP: 002b:00007fff745abd48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    [ 8.349179] RAX: ffffffffffffffda RBX: 00007fff745abe70 RCX: 00007f591191da67
    [ 8.350431] RDX: 0000000000000000 RSI: 00007fff745abdc0 RDI: 0000000000000003
    [ 8.351659] RBP: 000000005af35251 R08: 0000000000000001 R09: 0000000000000000
    [ 8.352922] R10: 00000000000005f1 R11: 0000000000000246 R12: 0000000000000000
    [ 8.354183] R13: 00007fff745afed0 R14: 0000000000000001 R15: 00000000006767c0
    [ 8.355400] Code: 41 89 d4 53 89 f5 48 89 fb e8 aa 20 fd ff 85 c0 0f 84 ed 00
    00 00 48 85 db 0f 84 cf 00 00 00 40 84 ed 0f 85 cd 00 00 00 45 84 e4 <8b> 53 30
    74 0d 85 d2 b8 ff ff ff ff 0f 8f b3 00 00 00 8b 43 2c
    [ 8.358699] RIP: __tcf_idr_release+0x33/0x140 RSP: ffffa0718038f840
    [ 8.359770] CR2: 0000000000021130
    [ 8.360438] ---[ end trace 60c66be45dfc14f0 ]---

    The caller calls action's ->init() and passes pointer to "struct tc_action *a",
    which later may be initialized to point at the existing action, otherwise
    "struct tc_action *a" is still invalid, and therefore dereferencing it is an
    error as happens in tcf_idr_release, where refcnt is decremented.

    So in case of missing flags tcf_idr_release must be called only for
    existing actions.

    v2:
    - prepare patch for net tree

    Fixes: 5e1567aeb7fe ("net sched: skbedit action fix late binding")
    Signed-off-by: Roman Mashak <mrv@mojatatu.com>
    Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/sched/act_skbedit.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/net/sched/act_skbedit.c
    +++ b/net/sched/act_skbedit.c
    @@ -121,7 +121,8 @@ static int tcf_skbedit_init(struct net *
    return 0;

    if (!flags) {
    - tcf_idr_release(*a, bind);
    + if (exists)
    + tcf_idr_release(*a, bind);
    return -EINVAL;
    }


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