Hello, syzbot found the following crash on: HEAD commit: 4703d911 Merge tag 'xarray-5.5' of git://git.infradead.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11601611e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153 dashboard link: https://syzkaller.appspot.com/bug?extid=a85062dec5d65617cc1c compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1301ed85e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b7b79ee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a85062dec5d65617cc1c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-out-of-bounds in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_destroy+0x1d2/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:64 Read of size 8 at addr ffff8880a71e5e00 by task syz-executor455/8657 CPU: 1 PID: 8657 Comm: syz-executor455 Not tainted 5.5.0-rc7-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_ipmac_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline] bitmap_ipmac_destroy+0x1d2/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:64 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: 0033:0x4413f9 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:00007ffdcc88fa08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004413f9 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 00000000000100d9 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402220 R13: 00000000004022b0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8657: 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_ipmac net/netfilter/ipset/ip_set_bitmap_ipmac.c:302 [inline] bitmap_ipmac_create+0x3d9/0x840 net/netfilter/ipset/ip_set_bitmap_ipmac.c:365 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 0: (stack is not available) The buggy address belongs to the object at ffff8880a71e4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7680 bytes inside of 8192-byte region [ffff8880a71e4000, ffff8880a71e6000) The buggy address belongs to the page: page:ffffea00029c7900 refcount:1 mapcount:0 mapping:ffff8880aa8021c0 index:0x0 compound_mapcount: 0 raw: 00fffe0000010200 ffffea000230b908 ffff8880aa801b48 ffff8880aa8021c0 raw: 0000000000000000 ffff8880a71e4000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a71e5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a71e5d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a71e5e00: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a71e5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a71e5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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