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| author | Eric Dumazet <edumazet@google.com> | 2017-07-03 02:54:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-03 03:29:14 -0700 |
| commit | 5361e209dd30040dade51ea7c8f97f4090b30116 (patch) | |
| tree | 05c5a0cfd3a6adf703cfd498c5fb1961d6b6c5af | |
| parent | 3b68067bd2752a76868f36bf79f745451cef2a05 (diff) | |
| download | linux-5361e209dd30040dade51ea7c8f97f4090b30116.tar.bz2 | |
net: avoid one splat in fib_nl_delrule()
We need to use refcount_set() on a newly created rule to avoid
following error :
[ 64.601749] ------------[ cut here ]------------
[ 64.601757] WARNING: CPU: 0 PID: 6476 at lib/refcount.c:184 refcount_sub_and_test+0x75/0xa0
[ 64.601758] Modules linked in: w1_therm wire cdc_acm ehci_pci ehci_hcd mlx4_en ib_uverbs mlx4_ib ib_core mlx4_core
[ 64.601769] CPU: 0 PID: 6476 Comm: ip Tainted: G W 4.12.0-smp-DEV #274
[ 64.601771] task: ffff8837bf482040 task.stack: ffff8837bdc08000
[ 64.601773] RIP: 0010:refcount_sub_and_test+0x75/0xa0
[ 64.601774] RSP: 0018:ffff8837bdc0f5c0 EFLAGS: 00010286
[ 64.601776] RAX: 0000000000000026 RBX: 0000000000000001 RCX: 0000000000000000
[ 64.601777] RDX: 0000000000000026 RSI: 0000000000000096 RDI: ffffed06f7b81eae
[ 64.601778] RBP: ffff8837bdc0f5d0 R08: 0000000000000004 R09: fffffbfff4a54c25
[ 64.601779] R10: 00000000cbc500e5 R11: ffffffffa52a6128 R12: ffff881febcf6f24
[ 64.601779] R13: ffff881fbf4eaf00 R14: ffff881febcf6f80 R15: ffff8837d7a4ed00
[ 64.601781] FS: 00007ff5a2f6b700(0000) GS:ffff881fff800000(0000) knlGS:0000000000000000
[ 64.601782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 64.601783] CR2: 00007ffcdc70d000 CR3: 0000001f9c91e000 CR4: 00000000001406f0
[ 64.601783] Call Trace:
[ 64.601786] refcount_dec_and_test+0x11/0x20
[ 64.601790] fib_nl_delrule+0xc39/0x1630
[ 64.601793] ? is_bpf_text_address+0xe/0x20
[ 64.601795] ? fib_nl_newrule+0x25e0/0x25e0
[ 64.601798] ? depot_save_stack+0x133/0x470
[ 64.601801] ? ns_capable+0x13/0x20
[ 64.601803] ? __netlink_ns_capable+0xcc/0x100
[ 64.601806] rtnetlink_rcv_msg+0x23a/0x6a0
[ 64.601808] ? rtnl_newlink+0x1630/0x1630
[ 64.601811] ? memset+0x31/0x40
[ 64.601813] netlink_rcv_skb+0x2d7/0x440
[ 64.601815] ? rtnl_newlink+0x1630/0x1630
[ 64.601816] ? netlink_ack+0xaf0/0xaf0
[ 64.601818] ? kasan_unpoison_shadow+0x35/0x50
[ 64.601820] ? __kmalloc_node_track_caller+0x4c/0x70
[ 64.601821] rtnetlink_rcv+0x28/0x30
[ 64.601823] netlink_unicast+0x422/0x610
[ 64.601824] ? netlink_attachskb+0x650/0x650
[ 64.601826] netlink_sendmsg+0x7b7/0xb60
[ 64.601828] ? netlink_unicast+0x610/0x610
[ 64.601830] ? netlink_unicast+0x610/0x610
[ 64.601832] sock_sendmsg+0xba/0xf0
[ 64.601834] ___sys_sendmsg+0x6a9/0x8c0
[ 64.601835] ? copy_msghdr_from_user+0x520/0x520
[ 64.601837] ? __alloc_pages_nodemask+0x160/0x520
[ 64.601839] ? memcg_write_event_control+0xd60/0xd60
[ 64.601841] ? __alloc_pages_slowpath+0x1d50/0x1d50
[ 64.601843] ? kasan_slab_free+0x71/0xc0
[ 64.601845] ? mem_cgroup_commit_charge+0xb2/0x11d0
[ 64.601847] ? lru_cache_add_active_or_unevictable+0x7d/0x1a0
[ 64.601849] ? __handle_mm_fault+0x1af8/0x2810
[ 64.601851] ? may_open_dev+0xc0/0xc0
[ 64.601852] ? __pmd_alloc+0x2c0/0x2c0
[ 64.601853] ? __fdget+0x13/0x20
[ 64.601855] __sys_sendmsg+0xc6/0x150
[ 64.601856] ? __sys_sendmsg+0xc6/0x150
[ 64.601857] ? SyS_shutdown+0x170/0x170
[ 64.601859] ? handle_mm_fault+0x28a/0x650
[ 64.601861] SyS_sendmsg+0x12/0x20
[ 64.601863] entry_SYSCALL_64_fastpath+0x13/0x94
Fixes: 717d1e993ad8 ("net: convert fib_rule.refcnt from atomic_t to refcount_t")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/fib_rules.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c index c4ecd9f75a47..a0093e1b0235 100644 --- a/net/core/fib_rules.c +++ b/net/core/fib_rules.c @@ -517,7 +517,7 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, last = r; } - fib_rule_get(rule); + refcount_set(&rule->refcnt, 1); if (last) list_add_rcu(&rule->list, &last->list); |