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SubjectWARNING in tcf_exts_destroy
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Hello,

syzbot found the following crash on:

HEAD commit: 770fbb32 Add linux-next specific files for 20200228
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15cd62ebe00000
kernel config: https://syzkaller.appspot.com/x/.config?x=576314276bce4ad5
dashboard link: https://syzkaller.appspot.com/bug?extid=0973b62b47d85718a84b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14ff65a3e00000

The bug was bisected to:

commit 599be01ee567b61f4471ee8078870847d0a11e8e
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Mon Feb 3 05:14:35 2020 +0000

net_sched: fix an OOB access in cls_tcindex

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14558983e00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=16558983e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12558983e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0973b62b47d85718a84b@syzkaller.appspotmail.com
Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")

------------[ cut here ]------------
virt_to_cache: Object is not a Slab page!
WARNING: CPU: 1 PID: 9596 at mm/slab.h:475 virt_to_cache mm/slab.h:475 [inline]
WARNING: CPU: 1 PID: 9596 at mm/slab.h:475 kfree+0x1cf/0x2b0 mm/slab.c:3749
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9596 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-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+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x35 kernel/panic.c:582
report_bug+0x27b/0x2f0 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:175 [inline]
fixup_bug arch/x86/kernel/traps.c:170 [inline]
do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:virt_to_cache mm/slab.h:475 [inline]
RIP: 0010:kfree+0x1cf/0x2b0 mm/slab.c:3749
Code: 50 ff e9 67 fe ff ff 80 3d 59 0d d2 08 00 75 1c 48 c7 c6 00 63 35 88 48 c7 c7 f8 49 47 89 c6 05 42 0d d2 08 01 e8 79 f5 94 ff <0f> 0b f6 c7 02 75 6b 48 83 3d aa 5c e4 07 00 0f 85 4e ff ff ff 0f
RSP: 0018:ffffc90002297040 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815c4e91 RDI: fffff52000452dfa
RBP: ffffffff8c6187e0 R08: ffff88808f282040 R09: ffffed1015ce45c9
R10: ffffed1015ce45c8 R11: ffff8880ae722e43 R12: ffffffff862da922
R13: dffffc0000000000 R14: ffff88809f212910 R15: 0000000000000000
tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
tcindex_change+0x203/0x2e0 net/sched/cls_tcindex.c:518
tc_new_tfilter+0xa59/0x20b0 net/sched/cls_api.c:2103
rtnetlink_rcv_msg+0x810/0xad0 net/core/rtnetlink.c:5431
netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0xec/0x1b0 net/socket.c:2430
do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f176bb01c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f176bb026d4 RCX: 000000000045c849
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009fd R14: 00000000004ccb4d R15: 000000000076bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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