[syzbot] KASAN: use-after-free Read in rxe_queue_cleanup

syzbot
2021-11-19T09:27:24Z

Hello,

syzbot found the following issue on:

HEAD commit: 8d0112ac6fd0 Merge tag 'net-5.16-rc2' of git://git.kernel...
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=14e3eeaab00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6d3b8fd1977c1e73
dashboard link: https://syzkaller.appspot.com/bug?extid=aab53008a5adf26abe91
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+aab53008a5adf26abe91@syzkaller.appspotmail.com

Free swap = 0kB
Total swap = 0kB
2097051 pages RAM
0 pages HighMem/MovableOnly
384517 pages reserved
0 pages cma reserved
==================================================================
BUG: KASAN: use-after-free in rxe_queue_cleanup+0xf4/0x100 drivers/infiniband/sw/rxe/rxe_queue.c:193
Read of size 8 at addr ffff88814a6b6e90 by task syz-executor.3/9534

CPU: 1 PID: 9534 Comm: syz-executor.3 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247
__kasan_report mm/kasan/report.c:433 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
rxe_queue_cleanup+0xf4/0x100 drivers/infiniband/sw/rxe/rxe_queue.c:193
rxe_qp_do_cleanup+0x5d/0xa60 drivers/infiniband/sw/rxe/rxe_qp.c:804
execute_in_process_context+0x37/0x150 kernel/workqueue.c:3359
rxe_elem_release+0x9f/0x180 drivers/infiniband/sw/rxe/rxe_pool.c:407
kref_put include/linux/kref.h:65 [inline]
rxe_create_qp+0x32c/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:450
create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238
ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349
ib_create_qp include/rdma/ib_verbs.h:3722 [inline]
create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2910
ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline]
ib_mad_init_device+0xd4d/0x13f0 drivers/infiniband/core/mad.c:3082
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:720
enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
ib_register_device drivers/infiniband/core/device.c:1419 [inline]
ib_register_device+0x854/0xb50 drivers/infiniband/core/device.c:1365
rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146
rxe_add+0x1331/0x1710 drivers/infiniband/sw/rxe/rxe.c:248
rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543
rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline]
rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251
nldev_newlink+0x30a/0x560 drivers/infiniband/core/nldev.c:1717
rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8f44e42ae9
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:00007f8f42397188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8f44f56020 RCX: 00007f8f44e42ae9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000007
RBP: 00007f8f44e9cf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffde16bb93f R14: 00007f8f42397300 R15: 0000000000022000
</TASK>

Allocated by task 9534:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:724 [inline]
rxe_queue_init+0x99/0x510 drivers/infiniband/sw/rxe/rxe_queue.c:66
rxe_qp_init_req drivers/infiniband/sw/rxe/rxe_qp.c:233 [inline]
rxe_qp_from_init+0x844/0x1bf0 drivers/infiniband/sw/rxe/rxe_qp.c:347
rxe_create_qp+0x231/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:442
create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238
ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349
ib_create_qp include/rdma/ib_verbs.h:3722 [inline]
create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2910
ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline]
ib_mad_init_device+0xd4d/0x13f0 drivers/infiniband/core/mad.c:3082
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:720
enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
ib_register_device drivers/infiniband/core/device.c:1419 [inline]
ib_register_device+0x854/0xb50 drivers/infiniband/core/device.c:1365
rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146
rxe_add+0x1331/0x1710 drivers/infiniband/sw/rxe/rxe.c:248
rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543
rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline]
rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251
nldev_newlink+0x30a/0x560 drivers/infiniband/core/nldev.c:1717
rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 9534:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xf6/0x560 mm/slub.c:4561
rxe_qp_from_init+0x161e/0x1bf0 drivers/infiniband/sw/rxe/rxe_qp.c:361
rxe_create_qp+0x231/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:442
create_qp+0x50c/0x880 drivers/infiniband/core/verbs.c:1238
ib_create_qp_kernel+0x9d/0x310 drivers/infiniband/core/verbs.c:1349
ib_create_qp include/rdma/ib_verbs.h:3722 [inline]
create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2910
ib_mad_port_open drivers/infiniband/core/mad.c:2991 [inline]
ib_mad_init_device+0xd4d/0x13f0 drivers/infiniband/core/mad.c:3082
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:720
enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
ib_register_device drivers/infiniband/core/device.c:1419 [inline]
ib_register_device+0x854/0xb50 drivers/infiniband/core/device.c:1365
rxe_register_device+0x2fe/0x3b0 drivers/infiniband/sw/rxe/rxe_verbs.c:1146
rxe_add+0x1331/0x1710 drivers/infiniband/sw/rxe/rxe.c:248
rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:543
rxe_newlink drivers/infiniband/sw/rxe/rxe.c:270 [inline]
rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:251
nldev_newlink+0x30a/0x560 drivers/infiniband/core/nldev.c:1717
rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88814a6b6e80
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff88814a6b6e80, ffff88814a6b6ec0)
The buggy address belongs to the page:
page:ffffea000529ad80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14a6b6
flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000200 ffffea000070c640 dead000000000003 ffff888010c41640
raw: 0000000000000000 0000000000200020 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 15105016000, free_ts 0
prep_new_page mm/page_alloc.c:2418 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2036
alloc_pages+0x29f/0x300 mm/mempolicy.c:2186
alloc_slab_page mm/slub.c:1793 [inline]
allocate_slab mm/slub.c:1930 [inline]
new_slab+0x32d/0x4a0 mm/slub.c:1993
___slab_alloc+0x918/0xfe0 mm/slub.c:3022
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:724 [inline]
dropmon_net_event+0x283/0x480 net/core/drop_monitor.c:1560
notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2002
call_netdevice_notifiers_extack net/core/dev.c:2014 [inline]
call_netdevice_notifiers net/core/dev.c:2028 [inline]
register_netdevice+0x1073/0x1500 net/core/dev.c:10364
register_netdev+0x2d/0x50 net/core/dev.c:10457
rose_proto_init+0x317/0x66a net/rose/af_rose.c:1531
do_one_initcall+0x103/0x650 init/main.c:1297
do_initcall_level init/main.c:1370 [inline]
do_initcalls init/main.c:1386 [inline]
do_basic_setup init/main.c:1405 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1610
page_owner free stack trace missing

Memory state around the buggy address:
ffff88814a6b6d80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88814a6b6e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88814a6b6e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88814a6b6f00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88814a6b6f80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================

---
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