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BUG: KASAN: use-after-free in inet_frag_destroy_rcu+0xd9/0xe0 net/ipv4/inet_fragment.c:201
Read of size 8 at addr ffff8880881dc2d8 by task syz-executor.1/17794
CPU: 0 PID: 17794 Comm: syz-executor.1 Not tainted 5.2.0-rc1+ #4
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+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188
__kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
kasan_report+0x12/0x20 mm/kasan/common.c:614
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
inet_frag_destroy_rcu+0xd9/0xe0 net/ipv4/inet_fragment.c:201
__rcu_reclaim kernel/rcu/rcu.h:222 [inline]
rcu_do_batch kernel/rcu/tree.c:2092 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline]
rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291
__do_softirq+0x25c/0x94c kernel/softirq.c:293
invoke_softirq kernel/softirq.c:374 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:414
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 aa c3 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0018:ffff888054677848 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffffea0000b604c0 RCX: 0000000000001000
RDX: 1ffff11011927277 RSI: ffffffff81a89e48 RDI: ffff88802d813000
RBP: ffff8880546778a0 R08: ffff88808c938200 R09: ffffed1005b02600
R10: fffff9400016c09e R11: ffffea0000b604f7 R12: ffffea0000b604c0
R13: ffff88808c938200 R14: 0000000000000000 R15: dffffc0000000000
get_page_from_freelist+0x1726/0x4120 mm/page_alloc.c:3619
__alloc_pages_nodemask+0x2d0/0x8d0 mm/page_alloc.c:4657
alloc_pages_current+0x107/0x210 mm/mempolicy.c:2132
alloc_pages include/linux/gfp.h:509 [inline]
__vmalloc_area_node mm/vmalloc.c:2381 [inline]
__vmalloc_node_range+0x4b0/0x790 mm/vmalloc.c:2443
__vmalloc_node mm/vmalloc.c:2498 [inline]
__vmalloc_node_flags_caller+0x71/0x90 mm/vmalloc.c:2520
bpf_map_area_alloc+0x71/0x90 kernel/bpf/syscall.c:159
sock_hash_alloc net/core/sock_map.c:824 [inline]
sock_hash_alloc+0x386/0x5b0 net/core/sock_map.c:786
find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
map_create kernel/bpf/syscall.c:570 [inline]
__do_sys_bpf+0x730/0x43d0 kernel/bpf/syscall.c:2795
__se_sys_bpf kernel/bpf/syscall.c:2772 [inline]
__x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2772
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f05ace29c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 000000000000003c RSI: 0000000020000040 RDI: 0000000000000000
RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f05ace2a6d4
R13: 00000000004bf5b6 R14: 00000000004d0900 R15: 00000000ffffffff
Allocated by task 15265:
save_stack+0x23/0x90 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_kmalloc mm/kasan/common.c:489 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555
kmalloc include/linux/slab.h:547 [inline]
kzalloc include/linux/slab.h:742 [inline]
fqdir_init include/net/inet_frag.h:115 [inline]
nf_ct_net_init+0x4a/0x4d0 net/ipv6/netfilter/nf_conntrack_reasm.c:492
ops_init+0xb3/0x410 net/core/net_namespace.c:130
setup_net+0x2d3/0x740 net/core/net_namespace.c:316
copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439
create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107
unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206
ksys_unshare+0x440/0x980 kernel/fork.c:2692
__do_sys_unshare kernel/fork.c:2760 [inline]
__se_sys_unshare kernel/fork.c:2758 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:2758
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 12:
save_stack+0x23/0x90 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
__cache_free mm/slab.c:3432 [inline]
kfree+0xcf/0x220 mm/slab.c:3755
fqdir_rwork_fn+0x33/0x40 net/ipv4/inet_fragment.c:154
process_one_work+0x989/0x1790 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x354/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8880881dc2c0
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
512-byte region [ffff8880881dc2c0, ffff8880881dc4c0)
The buggy address belongs to the page:
page:ffffea0002207700 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000266b988 ffffea00027534c8 ffff8880aa400940
raw: 0000000000000000 ffff8880881dc040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880881dc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880881dc200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880881dc280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff8880881dc300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880881dc380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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