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BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282
Read of size 2 at addr ffff8881e1e0740b by task syz-executor.4/1715
CPU: 0 PID: 1715 Comm: syz-executor.4 Not tainted 5.4.111-syzkaller-00141-gce6a5172613f #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+0x1d8/0x24e lib/dump_stack.c:118
print_address_description+0x9b/0x650 mm/kasan/report.c:384
__kasan_report+0x182/0x260 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:641
eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282
dev_parse_header_protocol include/linux/netdevice.h:3016 [inline]
virtio_net_hdr_to_skb+0x6de/0xd70 include/linux/virtio_net.h:83
packet_snd net/packet/af_packet.c:2976 [inline]
packet_sendmsg+0x483a/0x6780 net/packet/af_packet.c:3013
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg net/socket.c:658 [inline]
sock_write_iter+0x330/0x450 net/socket.c:990
call_write_iter include/linux/fs.h:1971 [inline]
aio_write+0x47b/0x610 fs/aio.c:1584
__io_submit_one fs/aio.c:1843 [inline]
io_submit_one+0xa59/0x2300 fs/aio.c:1886
__do_sys_io_submit fs/aio.c:1945 [inline]
__se_sys_io_submit+0x189/0x3d0 fs/aio.c:1915
do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f99463cb188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000020000080 RSI: 0000000000000001 RDI: 00007f99463aa000
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff4746507f R14: 00007f99463cb300 R15: 0000000000022000
Allocated by task 1182:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2821 [inline]
slab_alloc mm/slub.c:2829 [inline]
kmem_cache_alloc+0x115/0x290 mm/slub.c:2834
getname_flags+0xba/0x640 fs/namei.c:141
do_sys_open+0x33e/0x7c0 fs/open.c:1087
do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 1182:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:333 [inline]
__kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475
slab_free_hook mm/slub.c:1454 [inline]
slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492
slab_free mm/slub.c:3072 [inline]
kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088
do_sys_open+0x62e/0x7c0 fs/open.c:1102
do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff8881e1e06600
which belongs to the cache names_cache of size 4096
The buggy address is located 3595 bytes inside of
4096-byte region [ffff8881e1e06600, ffff8881e1e07600)
The buggy address belongs to the page:
page:ffffea0007878000 refcount:1 mapcount:0 mapping:ffff8881f5cfb180 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfb180
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881e1e07300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e1e07380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e1e07400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881e1e07480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e1e07500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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