Hello, syzbot found the following crash on: HEAD commit: 8f8972a3 Merge tag 'mtd/fixes-for-5.5-rc7' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1327fa85e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfbb8fa33f49f9f3 dashboard link: https://syzkaller.appspot.com/bug?extid=8b5f151de2f35100bbc5 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e22559e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16056faee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8b5f151de2f35100bbc5@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] BUG: KASAN: use-after-free in bitmap_ip_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline] BUG: KASAN: use-after-free in bitmap_ip_destroy+0x1f2/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:65 Read of size 8 at addr ffff888096ae7ec0 by task syz-executor670/8711 CPU: 0 PID: 8711 Comm: syz-executor670 Not tainted 5.5.0-rc6-syzkaller #0 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+0x1fb/0x318 lib/dump_stack.c:118 print_address_description+0x74/0x5c0 mm/kasan/report.c:374 __kasan_report+0x149/0x1c0 mm/kasan/report.c:506 kasan_report+0x26/0x50 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:182 [inline] check_memory_region+0x2b6/0x2f0 mm/kasan/generic.c:192 __kasan_check_read+0x11/0x20 mm/kasan/common.c:95 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] bitmap_ip_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline] bitmap_ip_destroy+0x1f2/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:65 ip_set_create+0xae0/0xfd0 net/netfilter/ipset/ip_set_core.c:1165 nfnetlink_rcv_msg+0x9ae/0xcd0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1e0/0x1e50 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441459 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc4e627408 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441459 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 000000000001283d R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402280 R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8711: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:513 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x254/0x340 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc+0x21/0x40 include/linux/slab.h:670 ip_set_alloc+0x32/0x60 net/netfilter/ipset/ip_set_core.c:255 init_map_ip net/netfilter/ipset/ip_set_bitmap_ip.c:223 [inline] bitmap_ip_create+0x48b/0xac0 net/netfilter/ipset/ip_set_bitmap_ip.c:327 ip_set_create+0x421/0xfd0 net/netfilter/ipset/ip_set_core.c:1111 nfnetlink_rcv_msg+0x9ae/0xcd0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1e0/0x1e50 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8711: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10d/0x220 mm/slab.c:3757 kvfree+0x46/0x50 mm/util.c:603 ip_set_free+0x15/0x20 net/netfilter/ipset/ip_set_core.c:276 bitmap_ip_destroy+0xb6/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:63 ip_set_create+0xae0/0xfd0 net/netfilter/ipset/ip_set_core.c:1165 nfnetlink_rcv_msg+0x9ae/0xcd0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1e0/0x1e50 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888096ae7ec0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff888096ae7ec0, ffff888096ae7ee0) The buggy address belongs to the page: page:ffffea00025ab9c0 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff888096ae7fc1 raw: 00fffe0000000200 ffffea00027e2388 ffffea0002844388 ffff8880aa8001c0 raw: ffff888096ae7fc1 ffff888096ae7000 000000010000003a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888096ae7d80: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc ffff888096ae7e00: 00 02 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc >ffff888096ae7e80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff888096ae7f00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff888096ae7f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
