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SubjectKASAN: slab-out-of-bounds Read in bitmap_port_destroy
From
Hello,

syzbot found the following crash on:

HEAD commit: 131701c6 Merge tag 'leds-5.5-rc8' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11897a11e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
dashboard link: https://syzkaller.appspot.com/bug?extid=b96275fd6ad891076ced
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15fba721e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1339726ee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b96275fd6ad891076ced@syzkaller.appspotmail.com

==================================================================
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_port_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_port_destroy+0x1d2/0x3c0 net/netfilter/ipset/ip_set_bitmap_gen.h:64
Read of size 8 at addr ffff88809e7c2080 by task syz-executor377/8828

CPU: 1 PID: 8828 Comm: syz-executor377 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_port_ext_cleanup net/netfilter/ipset/ip_set_bitmap_gen.h:51 [inline]
bitmap_port_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: 0033:0x441399
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:00007ffc59587e48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441399
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000011f0f R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004021c0
R13: 0000000000402250 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8828:
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_port net/netfilter/ipset/ip_set_bitmap_port.c:234 [inline]
bitmap_port_create+0x32c/0x790 net/netfilter/ipset/ip_set_bitmap_port.c:276
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 8498:
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
single_release+0x91/0xa0 fs/seq_file.c:609
__fput+0x2e4/0x740 fs/file_table.c:280
____fput+0x15/0x20 fs/file_table.c:313
task_work_run+0x176/0x1b0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop arch/x86/entry/common.c:164 [inline]
prepare_exit_to_usermode+0x480/0x5b0 arch/x86/entry/common.c:195
syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:278
do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:304
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809e7c2080
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff88809e7c2080, ffff88809e7c20a0)
The buggy address belongs to the page:
page:ffffea000279f080 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff88809e7c2fc1
raw: 00fffe0000000200 ffffea00028b5b08 ffffea0002a03b48 ffff8880aa8001c0
raw: ffff88809e7c2fc1 ffff88809e7c2000 000000010000003d 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff88809e7c1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88809e7c2000: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc
>ffff88809e7c2080: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff88809e7c2100: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
ffff88809e7c2180: 00 00 01 fc fc fc fc fc 00 03 fc fc fc fc fc fc
==================================================================


---
This bug is generated by a bot. It may contain errors.
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