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BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: use-after-free in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline]
BUG: KASAN: use-after-free in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000
Read of size 2324 at addr ffff888018e832f7 by task syz-executor.5/10511

CPU: 1 PID: 10511 Comm: syz-executor.5 Not tainted 5.11.0-rc4-next-20210120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:397 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:414
 check_region_inline mm/kasan/generic.c:180 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
 memcpy+0x20/0x60 mm/kasan/shadow.c:65
 memcpy include/linux/fortify-string.h:191 [inline]
 skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline]
 skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000
 udp4_ufo_fragment+0x4ae/0x700 net/ipv4/udp_offload.c:363
 inet_gso_segment+0x502/0x1110 net/ipv4/af_inet.c:1378
 skb_mac_gso_segment+0x26e/0x530 net/core/dev.c:3326
 __skb_gso_segment+0x330/0x6e0 net/core/dev.c:3399
 skb_gso_segment include/linux/netdevice.h:4712 [inline]
 validate_xmit_skb+0x69e/0xee0 net/core/dev.c:3644
 __dev_queue_xmit+0x988/0x2dd0 net/core/dev.c:4142
 packet_snd net/packet/af_packet.c:3006 [inline]
 packet_sendmsg+0x2406/0x52a0 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 __sys_sendto+0x21c/0x320 net/socket.c:1975
 __do_sys_sendto net/socket.c:1987 [inline]
 __se_sys_sendto net/socket.c:1983 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1e5f4d3c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219
RDX: 000000000000fc13 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 000000000119bfd8 R08: 0000000000000000 R09: 000000000000002f
R10: 0000000000000800 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc34a0ac6f R14: 00007f1e5f4d49c0 R15: 000000000119bf8c

Allocated by task 9:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:403 [inline]
 ____kasan_kmalloc mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406
 kasan_slab_alloc include/linux/kasan.h:208 [inline]
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slub.c:2910 [inline]
 kmem_cache_alloc_node+0x164/0x3c0 mm/slub.c:2946
 blk_alloc_queue+0x28/0x710 block/blk-core.c:523
 blk_mq_init_queue_data block/blk-mq.c:3004 [inline]
 blk_mq_init_queue+0x44/0xd0 block/blk-mq.c:3023
 floppy_alloc_disk+0x83/0x390 drivers/block/floppy.c:4592
 do_floppy_init drivers/block/floppy.c:4667 [inline]
 floppy_async_init+0x2ec/0x2021 drivers/block/floppy.c:4834
 async_run_entry_fn+0xd3/0x6f0 kernel/async.c:123
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3011 [inline]
 call_rcu+0xbb/0x750 kernel/rcu/tree.c:3086
 kobject_cleanup lib/kobject.c:705 [inline]
 kobject_release lib/kobject.c:736 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c8/0x540 lib/kobject.c:753
 do_floppy_init drivers/block/floppy.c:4823 [inline]
 floppy_async_init+0x1f40/0x2021 drivers/block/floppy.c:4834
 async_run_entry_fn+0xd3/0x6f0 kernel/async.c:123
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the object at ffff888018e829a0
 which belongs to the cache request_queue of size 3424
The buggy address is located 2391 bytes inside of
 3424-byte region [ffff888018e829a0, ffff888018e83700)
The buggy address belongs to the page:
page:00000000c419ca59 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888018e86120 pfn:0x18e80
head:00000000c419ca59 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 ffffea00006e9400 0000000600000006 ffff888014a4c3c0
raw: ffff888018e86120 0000000080090001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888018e83180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888018e83200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888018e83280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888018e83300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888018e83380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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