netlink: 20 bytes leftover after parsing attributes in process `syz-executor527'.
==================================================================
BUG: KASAN: slab-out-of-bounds in test_and_clear_bit include/asm-generic/bitops-instrumented.h:185 [inline]
BUG: KASAN: slab-out-of-bounds in napi_hash_del net/core/dev.c:6228 [inline]
BUG: KASAN: slab-out-of-bounds in netif_napi_del+0x2c/0x7a0 net/core/dev.c:6323
Write of size 8 at addr ffff8881ddb17f10 by task syz-executor527/305
CPU: 0 PID: 305 Comm: syz-executor527 Not tainted 5.4.190-syzkaller-00044-g77dc925ddffb #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+0x18e/0x1d5 lib/dump_stack.c:118
print_address_description+0x8c/0x630 mm/kasan/report.c:384
__kasan_report+0xf6/0x130 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
check_memory_region_inline mm/kasan/generic.c:141 [inline]
check_memory_region+0x298/0x2d0 mm/kasan/generic.c:191
test_and_clear_bit include/asm-generic/bitops-instrumented.h:185 [inline]
napi_hash_del net/core/dev.c:6228 [inline]
netif_napi_del+0x2c/0x7a0 net/core/dev.c:6323
free_netdev+0x188/0x310 net/core/dev.c:9697
netdev_run_todo+0xa79/0xc80 net/core/dev.c:9447
rtnl_unlock net/core/rtnetlink.c:112 [inline]
rtnetlink_rcv_msg+0xa49/0xb90 net/core/rtnetlink.c:5263
netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2500
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x771/0x8d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x913/0xb90 net/netlink/af_netlink.c:1933
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg net/socket.c:658 [inline]
____sys_sendmsg+0x4ee/0x7c0 net/socket.c:2287
___sys_sendmsg net/socket.c:2341 [inline]
__sys_sendmsg+0x235/0x2f0 net/socket.c:2387
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f18abcb9e29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18abc6c308 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f18abd42428 RCX: 00007f18abcb9e29
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007f18abd42420 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18abd4242c
R13: 00007f18abd10004 R14: 74656e2f7665642f R15: 0000000000022000
Allocated by task 299:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
__kmalloc_track_caller+0xfb/0x280 mm/slub.c:4449
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0xb5/0x4d0 net/core/skbuff.c:210
__napi_alloc_skb+0x11f/0x540 net/core/skbuff.c:516
napi_alloc_skb include/linux/skbuff.h:2853 [inline]
page_to_skb+0x39/0x910 drivers/net/virtio_net.c:392
receive_mergeable+0x73e/0x2300 drivers/net/virtio_net.c:977
receive_buf+0x104/0x1940 drivers/net/virtio_net.c:1087
virtnet_receive drivers/net/virtio_net.c:1379 [inline]
virtnet_poll+0x554/0x10b0 drivers/net/virtio_net.c:1484
napi_poll+0x195/0x670 net/core/dev.c:6352
net_rx_action+0x2dd/0x890 net/core/dev.c:6420
__do_softirq+0x23e/0x643 kernel/softirq.c:292
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8881ddb17800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 784 bytes to the right of
1024-byte region [ffff8881ddb17800, ffff8881ddb17c00)
The buggy address belongs to the page:
page:ffffea000776c400 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02280
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC)
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook mm/page_alloc.c:2165 [inline]
prep_new_page+0x194/0x380 mm/page_alloc.c:2171
get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857
alloc_slab_page+0x39/0x3e0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x97/0x450 mm/slub.c:1749
new_slab_objects mm/slub.c:2506 [inline]
___slab_alloc+0x320/0x4b0 mm/slub.c:2667
__slab_alloc+0x5a/0x90 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
__kmalloc_track_caller+0x168/0x280 mm/slub.c:4449
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0xb5/0x4d0 net/core/skbuff.c:210
__napi_alloc_skb+0x11f/0x540 net/core/skbuff.c:516
napi_alloc_skb include/linux/skbuff.h:2853 [inline]
page_to_skb+0x39/0x910 drivers/net/virtio_net.c:392
receive_mergeable+0x73e/0x2300 drivers/net/virtio_net.c:977
receive_buf+0x104/0x1940 drivers/net/virtio_net.c:1087
virtnet_receive drivers/net/virtio_net.c:1379 [inline]
virtnet_poll+0x554/0x10b0 drivers/net/virtio_net.c:1484
napi_poll+0x195/0x670 net/core/dev.c:6352
net_rx_action+0x2dd/0x890 net/core/dev.c:6420
page_owner free stack trace missing
Memory state around the buggy address:
ffff8881ddb17e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881ddb17e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881ddb17f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881ddb17f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881ddb18000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 305 Comm: syz-executor527 Tainted: G B 5.4.190-syzkaller-00044-g77dc925ddffb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:flush_gro_hash net/core/dev.c:6313 [inline]
RIP: 0010:netif_napi_del+0x28f/0x7a0 net/core/dev.c:6328
Code: 00 74 08 4c 89 ff e8 d0 39 32 fe 49 8b 2f 49 39 ef 75 10 e8 03 cd 05 fe eb 35 90 e8 fb cc 05 fe 48 89 dd 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 a2 39 32 fe 48 8b 5d 00 48 89 ef
RSP: 0018:ffff8881e2db7790 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1103bb62fff RCX: ffffffff835a6db0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881ddb17f38
RBP: 0000000000000000 R08: ffffffff835a6b83 R09: fffffbfff0d3170d
R10: fffffbfff0d3170d R11: 1ffffffff0d3170c R12: ffff8881ddb17f00
R13: dffffc0000000000 R14: ffff8881ddb17f00 R15: ffff8881ddb17f38
FS: 00007f18abc6c700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffee66ba058 CR3: 00000001ddfa2000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
free_netdev+0x188/0x310 net/core/dev.c:9697
netdev_run_todo+0xa79/0xc80 net/core/dev.c:9447
rtnl_unlock net/core/rtnetlink.c:112 [inline]
rtnetlink_rcv_msg+0xa49/0xb90 net/core/rtnetlink.c:5263
netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2500
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x771/0x8d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x913/0xb90 net/netlink/af_netlink.c:1933
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg net/socket.c:658 [inline]
____sys_sendmsg+0x4ee/0x7c0 net/socket.c:2287
___sys_sendmsg net/socket.c:2341 [inline]
__sys_sendmsg+0x235/0x2f0 net/socket.c:2387
do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f18abcb9e29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18abc6c308 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f18abd42428 RCX: 00007f18abcb9e29
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007f18abd42420 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18abd4242c
R13: 00007f18abd10004 R14: 74656e2f7665642f R15: 0000000000022000
Modules linked in:
---[ end trace 6244634e42fd974d ]---
RIP: 0010:flush_gro_hash net/core/dev.c:6313 [inline]
RIP: 0010:netif_napi_del+0x28f/0x7a0 net/core/dev.c:6328
Code: 00 74 08 4c 89 ff e8 d0 39 32 fe 49 8b 2f 49 39 ef 75 10 e8 03 cd 05 fe eb 35 90 e8 fb cc 05 fe 48 89 dd 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 a2 39 32 fe 48 8b 5d 00 48 89 ef
RSP: 0018:ffff8881e2db7790 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1103bb62fff RCX: ffffffff835a6db0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881ddb17f38
RBP: 0000000000000000 R08: ffffffff835a6b83 R09: fffffbfff0d3170d
R10: fffffbfff0d3170d R11: 1ffffffff0d3170c R12: ffff8881ddb17f00
R13: dffffc0000000000 R14: ffff8881ddb17f00 R15: ffff8881ddb17f38
FS: 00007f18abc6c700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffee66ba058 CR3: 00000001ddfa2000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 74 08 4c add %dh,0x4c(%rax,%rcx,1)
4: 89 ff mov %edi,%edi
6: e8 d0 39 32 fe callq 0xfe3239db
b: 49 8b 2f mov (%r15),%rbp
e: 49 39 ef cmp %rbp,%r15
11: 75 10 jne 0x23
13: e8 03 cd 05 fe callq 0xfe05cd1b
18: eb 35 jmp 0x4f
1a: 90 nop
1b: e8 fb cc 05 fe callq 0xfe05cd1b
20: 48 89 dd mov %rbx,%rbp
23: 48 89 e8 mov %rbp,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 ef mov %rbp,%rdi
34: e8 a2 39 32 fe callq 0xfe3239db
39: 48 8b 5d 00 mov 0x0(%rbp),%rbx
3d: 48 89 ef mov %rbp,%rdi