R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd9605dd80 R13: 0000000000000009 R14: 0000000000000000 R15: 0507002400000074 netlink: 24 bytes leftover after parsing attributes in process `syz-executor372'. ================================================================== BUG: KASAN: use-after-free in qdisc_class_find include/net/sch_generic.h:528 [inline] BUG: KASAN: use-after-free in qfq_find_class net/sched/sch_qfq.c:214 [inline] BUG: KASAN: use-after-free in qfq_search_class+0x16e/0x1a0 net/sched/sch_qfq.c:565 Read of size 4 at addr ffff8880a0f21b40 by task syz-executor372/11117 CPU: 0 PID: 11117 Comm: syz-executor372 Not tainted 4.19.105-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.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 qdisc_class_find include/net/sch_generic.h:528 [inline] qfq_find_class net/sched/sch_qfq.c:214 [inline] qfq_search_class+0x16e/0x1a0 net/sched/sch_qfq.c:565 tc_ctl_tclass+0x73b/0xc60 net/sched/sch_api.c:1956 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4471f9 Code: e8 0c bb 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 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcd9603cd78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006dcc78 RCX: 00000000004471f9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 000000000000000f RBP: 00000000006dcc70 R08: 0000000000000001 R09: 0000000000000036 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd9603cd80 R13: 0000000000000010 R14: 0000000000000000 R15: 0507002400000074 Allocated by task 11102: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] qfq_change_class+0x7e1/0x15ce net/sched/sch_qfq.c:476 tc_ctl_tclass+0x4f8/0xc60 net/sched/sch_api.c:1992 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11102: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 qfq_change_class+0xff7/0x15ce net/sched/sch_qfq.c:530 tc_ctl_tclass+0x4f8/0xc60 net/sched/sch_api.c:1992 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a0f21b40 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff8880a0f21b40, ffff8880a0f21bc0) The buggy address belongs to the page: page:ffffea000283c840 count:1 mapcount:0 mapping:ffff88812c31c640 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea0002a1bbc8 ffffea00026c0f48 ffff88812c31c640 raw: 0000000000000000 ffff8880a0f21000 0000000100000015 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a0f21a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a0f21a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a0f21b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880a0f21b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a0f21c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ==================================================================