net/smc: init conn.tx_work & conn.send_lock sooner
syzkaller found that following program crashes the host : { int fd = socket(AF_SMC, SOCK_STREAM, 0); int val = 1; listen(fd, 0); shutdown(fd, SHUT_RDWR); setsockopt(fd, 6, TCP_NODELAY, &val, 4); } Simply initialize conn.tx_work & conn.send_lock at socket creation, rather than deeper in the stack. ODEBUG: assert_init not available (active state 0) object type: timer_list hint: (null) WARNING: CPU: 1 PID: 13988 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 13988 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #46 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 panic+0x22f/0x4de kernel/panic.c:184 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326 RSP: 0018:ffff880197a37880 EFLAGS: 00010086 RAX: 0000000000000061 RBX: 0000000000000005 RCX: ffffc90001ed0000 RDX: 0000000000004aaf RSI: ffffffff8160f6f1 RDI: 0000000000000001 RBP: ffff880197a378c0 R08: ffff8801aa7a0080 R09: ffffed003b5e3eb2 R10: ffffed003b5e3eb2 R11: ffff8801daf1f597 R12: 0000000000000001 R13: ffffffff88d96980 R14: ffffffff87fa19a0 R15: ffffffff81666ec0 debug_object_assert_init+0x309/0x500 lib/debugobjects.c:692 debug_timer_assert_init kernel/time/timer.c:724 [inline] debug_assert_init kernel/time/timer.c:776 [inline] del_timer+0x74/0x140 kernel/time/timer.c:1198 try_to_grab_pending+0x439/0x9a0 kernel/workqueue.c:1223 mod_delayed_work_on+0x91/0x250 kernel/workqueue.c:1592 mod_delayed_work include/linux/workqueue.h:541 [inline] smc_setsockopt+0x387/0x6d0 net/smc/af_smc.c:1367 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: 01d2f7e2 ("net/smc: sockopts TCP_NODELAY and TCP_CORK") Signed-off-by:Eric Dumazet <edumazet@google.com> Cc: Ursula Braun <ubraun@linux.ibm.com> Cc: linux-s390@vger.kernel.org Reported-by:
syzbot <syzkaller@googlegroups.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
3b734ff6
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