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with SMTP id g6mr7513296ilq.37.1579475829370; Sun, 19 Jan 2020 15:17:09 -0800 (PST) Date: Sun, 19 Jan 2020 15:17:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bdb5b2059c865f5c@google.com> Subject: KASAN: slab-out-of-bounds Read in bitmap_ip_ext_cleanup From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, florent.fourcot@wifirst.fr, fw@strlen.de, jeremy@azazel.net, johannes.berg@intel.com, kadlec@netfilter.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pablo@netfilter.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 09d4f10a net: sched: act_ctinfo: fix memory leak git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=15fec135e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7e89bd00623fe71e dashboard link: https://syzkaller.appspot.com/bug?extid=6491ea8f6dddbf04930e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=141af959e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1067fa85e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6491ea8f6dddbf04930e@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_ip_ext_cleanup+0xd8/0x290 net/netfilter/ipset/ip_set_bitmap_gen.h:51 Read of size 8 at addr ffff8880a7d15c80 by task syz-executor874/9996 CPU: 1 PID: 9996 Comm: syz-executor874 Not tainted 5.5.0-rc5-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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 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+0xd8/0x290 net/netfilter/ipset/ip_set_bitmap_gen.h:51 bitmap_ip_destroy+0x180/0x1d0 net/netfilter/ipset/ip_set_bitmap_gen.h:64 ip_set_create+0xe47/0x1500 net/netfilter/ipset/ip_set_core.c:1165 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:659 ____sys_sendmsg+0x753/0x880 net/socket.c:2330 ___sys_sendmsg+0x100/0x170 net/socket.c:2384 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424 do_syscall_64+0xfa/0x790 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:00007ffee4e5cf88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441459 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 000000000001ac44 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402280 R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9996: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:670 [inline] ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255 init_map_ip net/netfilter/ipset/ip_set_bitmap_ip.c:223 [inline] bitmap_ip_create+0x6ec/0xc20 net/netfilter/ipset/ip_set_bitmap_ip.c:327 ip_set_create+0x6f1/0x1500 net/netfilter/ipset/ip_set_core.c:1111 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:659 ____sys_sendmsg+0x753/0x880 net/socket.c:2330 ___sys_sendmsg+0x100/0x170 net/socket.c:2384 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9722: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 single_release+0x95/0xc0 fs/seq_file.c:609 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7d15c80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8880a7d15c80, ffff8880a7d15ca0) The buggy address belongs to the page: page:ffffea00029f4540 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a7d15fc1 raw: 00fffe0000000200 ffffea00027c0bc8 ffffea00029aa6c8 ffff8880aa4001c0 raw: ffff8880a7d15fc1 ffff8880a7d15000 0000000100000034 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7d15b80: 00 05 fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a7d15c00: 00 00 00 fc fc fc fc fc 00 fc fc fc fc fc fc fc >ffff8880a7d15c80: 04 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff8880a7d15d00: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a7d15d80: 05 fc fc fc fc fc fc fc 00 00 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@googlegroups.com. 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