On 12/21/2017 04:13 PM, Tommi Rantala wrote: > Calling tipc_mon_delete() before the monitor has been created will oops. > This can happen in tipc_enable_bearer() error path if tipc_disc_create() > fails. > > [ 48.589074] BUG: unable to handle kernel paging request at 0000000000001008 > [ 48.590266] IP: tipc_mon_delete+0xea/0x270 [tipc] > [ 48.591223] PGD 1e60c5067 P4D 1e60c5067 PUD 1eb0cf067 PMD 0 > [ 48.592230] Oops: 0000 [#1] SMP KASAN > [ 48.595610] CPU: 5 PID: 1199 Comm: tipc Tainted: G B > 4.15.0-rc4-pc64-dirty #5 > [ 48.597176] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > 1.10.2-2.fc27 04/01/2014 > [ 48.598489] RIP: 0010:tipc_mon_delete+0xea/0x270 [tipc] > [ 48.599347] RSP: 0018:ffff8801d827f668 EFLAGS: 00010282 > [ 48.600705] RAX: ffff8801ee813f00 RBX: 0000000000000204 RCX: > 0000000000000000 > [ 48.602183] RDX: 1ffffffff1de6a75 RSI: 0000000000000297 RDI: > 0000000000000297 > [ 48.604373] RBP: 0000000000000000 R08: 0000000000000000 R09: > fffffbfff1dd1533 > [ 48.605607] R10: ffffffff8eafbb05 R11: fffffbfff1dd1534 R12: > 0000000000000050 > [ 48.607082] R13: dead000000000200 R14: ffffffff8e73f310 R15: > 0000000000001020 > [ 48.608228] FS: 00007fc686484800(0000) GS:ffff8801f5540000(0000) > knlGS:0000000000000000 > [ 48.610189] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 48.611459] CR2: 0000000000001008 CR3: 00000001dda70002 CR4: > 00000000003606e0 > [ 48.612759] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 48.613831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: > 0000000000000400 > [ 48.615038] Call Trace: > [ 48.615635] tipc_enable_bearer+0x415/0x5e0 [tipc] > [ 48.620623] tipc_nl_bearer_enable+0x1ab/0x200 [tipc] > [ 48.625118] genl_family_rcv_msg+0x36b/0x570 > [ 48.631233] genl_rcv_msg+0x5a/0xa0 > [ 48.631867] netlink_rcv_skb+0x1cc/0x220 > [ 48.636373] genl_rcv+0x24/0x40 > [ 48.637306] netlink_unicast+0x29c/0x350 > [ 48.639664] netlink_sendmsg+0x439/0x590 > [ 48.642014] SYSC_sendto+0x199/0x250 > [ 48.649912] do_syscall_64+0xfd/0x2c0 > [ 48.650651] entry_SYSCALL64_slow_path+0x25/0x25 > [ 48.651843] RIP: 0033:0x7fc6859848e3 > [ 48.652539] RSP: 002b:00007ffd25dff938 EFLAGS: 00000246 ORIG_RAX: > 000000000000002c > [ 48.654003] RAX: ffffffffffffffda RBX: 00007ffd25dff990 RCX: > 00007fc6859848e3 > [ 48.655303] RDX: 0000000000000054 RSI: 00007ffd25dff990 RDI: > 0000000000000003 > [ 48.656512] RBP: 00007ffd25dff980 R08: 00007fc685c35fc0 R09: > 000000000000000c > [ 48.657697] R10: 0000000000000000 R11: 0000000000000246 R12: > 0000000000d13010 > [ 48.658840] R13: 00007ffd25e009c0 R14: 0000000000000000 R15: > 0000000000000000 > [ 48.662972] RIP: tipc_mon_delete+0xea/0x270 [tipc] RSP: ffff8801d827f668 > [ 48.664073] CR2: 0000000000001008 > [ 48.664576] ---[ end trace e811818d54d5ce88 ]--- > > Signed-off-by: Tommi Rantala <[email protected]>
Acked-by: Ying Xue <[email protected]> > --- > net/tipc/monitor.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c > index 8e884ed06d4b..32dc33a94bc7 100644 > --- a/net/tipc/monitor.c > +++ b/net/tipc/monitor.c > @@ -642,9 +642,13 @@ void tipc_mon_delete(struct net *net, int bearer_id) > { > struct tipc_net *tn = tipc_net(net); > struct tipc_monitor *mon = tipc_monitor(net, bearer_id); > - struct tipc_peer *self = get_self(net, bearer_id); > + struct tipc_peer *self; > struct tipc_peer *peer, *tmp; > > + if (!mon) > + return; > + > + self = get_self(net, bearer_id); > write_lock_bh(&mon->lock); > tn->monitors[bearer_id] = NULL; > list_for_each_entry_safe(peer, tmp, &self->list, list) { > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ tipc-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tipc-discussion
