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BUG: KASAN: slab-out-of-bounds in tcindex_set_parms+0x1690/0x1b90 net/sched/cls_tcindex.c:455
Write of size 16 at addr ffff88807a76c8b8 by task syz-executor.0/8570

CPU: 1 PID: 8570 Comm: syz-executor.0 Not tainted 5.5.0-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+0x128/0x182 lib/dump_stack.c:118
 print_address_description.constprop.8.cold.10+0x9/0x317 mm/kasan/report.c:374
 __kasan_report.cold.11+0x1c/0x34 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:639
 tcindex_set_parms+0x1690/0x1b90 net/sched/cls_tcindex.c:455
 tcindex_change+0x1c2/0x280 net/sched/cls_tcindex.c:519
 tc_new_tfilter+0xffa/0x1da0 net/sched/cls_api.c:2103
 rtnetlink_rcv_msg+0x60c/0x8c0 net/core/rtnetlink.c:5429
 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2477
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xac/0xe0 net/socket.c:672
 ____sys_sendmsg+0x54e/0x750 net/socket.c:2343
 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397
 __sys_sendmsg+0xce/0x170 net/socket.c:2430
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x231/0xb27 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Allocated by task 8570:
 save_stack+0x19/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc.constprop.17+0xc1/0xd0 mm/kasan/common.c:513
 kmem_cache_alloc_trace+0x156/0x780 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 tcindex_set_parms+0x1b7/0x1b90 net/sched/cls_tcindex.c:325
 tcindex_change+0x1c2/0x280 net/sched/cls_tcindex.c:519
 tc_new_tfilter+0xffa/0x1da0 net/sched/cls_api.c:2103
 rtnetlink_rcv_msg+0x60c/0x8c0 net/core/rtnetlink.c:5429
 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2477
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xac/0xe0 net/socket.c:672
 ____sys_sendmsg+0x54e/0x750 net/socket.c:2343
 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397
 __sys_sendmsg+0xce/0x170 net/socket.c:2430
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x231/0xb27 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88807a76c800
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 184 bytes inside of
 192-byte region [ffff88807a76c800, ffff88807a76c8c0)
The buggy address belongs to the page:
page:ffffea0001e9db00 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0
raw: 00fffe0000000200 ffffea0001e9d808 ffff8880aa401148 ffff8880aa400000
raw: 0000000000000000 ffff88807a76c000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88807a76c780: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807a76c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807a76c880: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff88807a76c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807a76c980: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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