[syzbot] KASAN: use-after-free Write in rxrpc_put_bundle (2)

From: syzbot
Date: Sat Jul 03 2021 - 01:29:30 EST

Next message: kernel test robot: "[linux-stable-rc:linux-4.9.y 1986/2294] drivers/iommu/amd_iommu.c:1335:6: warning: variable 'flags' is used uninitialized whenever 'if' condition is true"
Previous message: Christoph Hellwig: "Re: [PATCH] block: Avoid accessing an already freed kobject in delete_partition"
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Hello,

syzbot found the following issue on:

HEAD commit: 62fb9874 Linux 5.13
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=107f6f30300000
kernel config: https://syzkaller.appspot.com/x/.config?x=317f9d1d95b8a90
dashboard link: https://syzkaller.appspot.com/bug?extid=b2ed14942e201ea556e0

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b2ed14942e201ea556e0@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline]
BUG: KASAN: use-after-free in rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141
Write of size 4 at addr ffff88801dcb5e20 by task ksoftirqd/1/19

CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.13.0-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+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233
__kasan_report mm/kasan/report.c:419 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436
check_region_inline mm/kasan/generic.c:180 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline]
rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141
rxrpc_destroy_connection+0x128/0x2c0 net/rxrpc/conn_object.c:365
rcu_do_batch kernel/rcu/tree.c:2558 [inline]
rcu_core+0x7ab/0x13b0 kernel/rcu/tree.c:2793
__do_softirq+0x29b/0x9f6 kernel/softirq.c:559
run_ksoftirqd kernel/softirq.c:921 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165
kthread+0x3b1/0x4a0 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 27342:
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:428 [inline]
____kasan_kmalloc mm/kasan/common.c:507 [inline]
____kasan_kmalloc mm/kasan/common.c:466 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:686 [inline]
rxrpc_alloc_bundle+0x82/0x2b0 net/rxrpc/conn_client.c:121
rxrpc_look_up_bundle net/rxrpc/conn_client.c:295 [inline]
rxrpc_prep_call net/rxrpc/conn_client.c:368 [inline]
rxrpc_connect_call+0x5bb/0x15d0 net/rxrpc/conn_client.c:704
rxrpc_new_client_call+0x961/0x1020 net/rxrpc/call_object.c:330
rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:605 [inline]
rxrpc_do_sendmsg+0xee8/0x1350 net/rxrpc/sendmsg.c:658
rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:560
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x331/0x810 net/socket.c:2337
___sys_sendmsg+0xf3/0x170 net/socket.c:2391
__sys_sendmmsg+0x195/0x470 net/socket.c:2477
__do_sys_sendmmsg net/socket.c:2506 [inline]
__se_sys_sendmmsg net/socket.c:2503 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2503
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 19:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:212 [inline]
slab_free_hook mm/slub.c:1583 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1608
slab_free mm/slub.c:3168 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4212
rxrpc_put_bundle net/rxrpc/conn_client.c:146 [inline]
rxrpc_put_bundle+0x6b/0x80 net/rxrpc/conn_client.c:138
rxrpc_destroy_connection+0x128/0x2c0 net/rxrpc/conn_object.c:365
rcu_do_batch kernel/rcu/tree.c:2558 [inline]
rcu_core+0x7ab/0x13b0 kernel/rcu/tree.c:2793
__do_softirq+0x29b/0x9f6 kernel/softirq.c:559

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
insert_work+0x48/0x370 kernel/workqueue.c:1332
__queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
queue_work_on+0xee/0x110 kernel/workqueue.c:1525
queue_work include/linux/workqueue.h:507 [inline]
call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435
kobject_uevent_env+0xf95/0x1650 lib/kobject_uevent.c:618
kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208
uevent_store+0x20/0x50 drivers/base/core.c:2370
dev_attr_store+0x50/0x80 drivers/base/core.c:2071
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write+0x426/0x650 fs/read_write.c:518
vfs_write+0x796/0xa30 fs/read_write.c:605
ksys_write+0x12d/0x250 fs/read_write.c:658
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to 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
insert_work+0x48/0x370 kernel/workqueue.c:1332
__queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
queue_work_on+0xee/0x110 kernel/workqueue.c:1525
queue_work include/linux/workqueue.h:507 [inline]
call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435
kobject_uevent_env+0xf95/0x1650 lib/kobject_uevent.c:618
kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208
uevent_store+0x20/0x50 drivers/base/core.c:2370
dev_attr_store+0x50/0x80 drivers/base/core.c:2071
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write+0x426/0x650 fs/read_write.c:518
vfs_write+0x796/0xa30 fs/read_write.c:605
ksys_write+0x12d/0x250 fs/read_write.c:658
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801dcb5e00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 32 bytes inside of
192-byte region [ffff88801dcb5e00, ffff88801dcb5ec0)
The buggy address belongs to the page:
page:ffffea0000772d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dcb5
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888011041a00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 8523, ts 188015122909, free_ts 187967405790
prep_new_page mm/page_alloc.c:2358 [inline]
get_page_from_freelist+0x1033/0x2b60 mm/page_alloc.c:3994
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5204
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
alloc_slab_page mm/slub.c:1646 [inline]
allocate_slab+0x2c5/0x4c0 mm/slub.c:1786
new_slab mm/slub.c:1849 [inline]
new_slab_objects mm/slub.c:2595 [inline]
___slab_alloc+0x4a1/0x810 mm/slub.c:2758
__slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2798
slab_alloc_node mm/slub.c:2880 [inline]
slab_alloc mm/slub.c:2922 [inline]
kmem_cache_alloc_trace+0x2a3/0x2c0 mm/slub.c:2939
kmalloc include/linux/slab.h:556 [inline]
addr_event.part.0+0x7b/0x4d0 drivers/infiniband/core/roce_gid_mgmt.c:839
addr_event drivers/infiniband/core/roce_gid_mgmt.c:823 [inline]
inet6addr_event+0x13e/0x1b0 drivers/infiniband/core/roce_gid_mgmt.c:882
notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
atomic_notifier_call_chain+0x8d/0x170 kernel/notifier.c:217
ipv6_add_addr+0x1750/0x1ef0 net/ipv6/addrconf.c:1152
inet6_addr_add+0x410/0xae0 net/ipv6/addrconf.c:2945
inet6_rtm_newaddr+0xf00/0x1970 net/ipv6/addrconf.c:4871
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5566
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1298 [inline]
free_pcp_prepare+0x223/0x300 mm/page_alloc.c:1342
free_unref_page_prepare mm/page_alloc.c:3250 [inline]
free_unref_page+0x12/0x1d0 mm/page_alloc.c:3298
unfreeze_partials+0x17c/0x1d0 mm/slub.c:2376
put_cpu_partial+0x13d/0x230 mm/slub.c:2412
qlink_free mm/kasan/quarantine.c:146 [inline]
qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:438
kasan_slab_alloc include/linux/kasan.h:236 [inline]
slab_post_alloc_hook mm/slab.h:524 [inline]
slab_alloc_node mm/slub.c:2914 [inline]
slab_alloc mm/slub.c:2922 [inline]
kmem_cache_alloc_trace+0x201/0x2c0 mm/slub.c:2939
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:686 [inline]
ipv6_add_addr+0x363/0x1ef0 net/ipv6/addrconf.c:1083
addrconf_add_linklocal+0x1ca/0x590 net/ipv6/addrconf.c:3182
addrconf_addr_gen+0x3a4/0x3e0 net/ipv6/addrconf.c:3313
addrconf_dev_config+0x26c/0x410 net/ipv6/addrconf.c:3360
addrconf_notify+0x362/0x23e0 net/ipv6/addrconf.c:3593
notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121
call_netdevice_notifiers_extack net/core/dev.c:2133 [inline]
call_netdevice_notifiers net/core/dev.c:2147 [inline]
__dev_notify_flags+0x110/0x2b0 net/core/dev.c:8798

Memory state around the buggy address:
ffff88801dcb5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801dcb5d80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801dcb5e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801dcb5e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88801dcb5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

---
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Next message: kernel test robot: "[linux-stable-rc:linux-4.9.y 1986/2294] drivers/iommu/amd_iommu.c:1335:6: warning: variable 'flags' is used uninitialized whenever 'if' condition is true"
Previous message: Christoph Hellwig: "Re: [PATCH] block: Avoid accessing an already freed kobject in delete_partition"
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