Cong Wang <xiyou.wangcong@xxxxxxxxx> wrote: > On Sat, Jan 11, 2020 at 10:05 AM syzbot > <syzbot+91bdd8eece0f6629ec8b@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: e69ec487 Merge branch 'for-linus' of git://git.kernel.org/.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=1239f876e00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616 > > dashboard link: https://syzkaller.appspot.com/bug?extid=91bdd8eece0f6629ec8b > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dbd58ee00000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15eff9e1e00000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+91bdd8eece0f6629ec8b@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > kasan: CONFIG_KASAN_INLINE enabled > > kasan: GPF could be caused by NULL-ptr deref or user memory access > > general protection fault: 0000 [#1] PREEMPT SMP KASAN > > CPU: 0 PID: 10213 Comm: syz-executor519 Not tainted 5.5.0-rc5-syzkaller #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] > > RIP: 0010:net_generic include/net/netns/generic.h:45 [inline] > > RIP: 0010:xt_rateest_put+0xa1/0x440 net/netfilter/xt_RATEEST.c:77 > > Code: 85 87 01 fb 45 84 f6 0f 84 68 02 00 00 e8 37 86 01 fb 49 8d bd 68 13 > > 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f > > 85 6c 03 00 00 4d 8b b5 68 13 00 00 e8 29 bf ed fa > > RSP: 0018:ffffc90001cd7940 EFLAGS: 00010202 > > RAX: dffffc0000000000 RBX: ffff8880a779f700 RCX: ffffffff8673a332 > > RDX: 000000000000026d RSI: ffffffff8673a0b9 RDI: 0000000000001368 > > RBP: ffffc90001cd7970 R08: ffff8880a96b2240 R09: ffffed1015d0703d > > R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 000000000000002d > > R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8673a470 > > FS: 00000000016ce880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 000055cd48aff140 CR3: 0000000096982000 CR4: 00000000001406f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > xt_rateest_tg_destroy+0x72/0xa0 net/netfilter/xt_RATEEST.c:175 > > cleanup_entry net/ipv4/netfilter/arp_tables.c:509 [inline] > > translate_table+0x11f4/0x1d80 net/ipv4/netfilter/arp_tables.c:587 > > do_replace net/ipv4/netfilter/arp_tables.c:981 [inline] > > do_arpt_set_ctl+0x317/0x650 net/ipv4/netfilter/arp_tables.c:1461 > > This looks odd, the head commit e69ec487 comes after commit > 1b789577f655060d98d20ed0c6f9fbd469d6ba63 which is supposed > to fix this... The fix is incomplete, net/ipv4/netfilter/arp_tables.c:cleanup_entry() doesn't init *net either. Are you working on a fix already? Otherwise I can handle this.
