[moderation] [rdma?] KASAN: slab-use-after-free Read in addr_handler

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a38297e3fb01 Linux 6.9
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16cb4a48980000
kernel config: https://syzkaller.appspot.com/x/.config?x=edefe34e4544d70e
dashboard link: https://syzkaller.appspot.com/bug?extid=0b80ca320ed831524a56
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [j...@ziepe.ca le...@kernel.org linux-...@vger.kernel.org linux...@vger.kernel.org net...@vger.kernel.org]

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a38297e3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eb6ef4d9e74f/vmlinux-a38297e3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce2fb6bcfd40/bzImage-a38297e3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0b80ca...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff8880110f13c4 by task kworker/u32:19/26726

CPU: 2 PID: 26726 Comm: kworker/u32:19 Not tainted 6.9.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: ib_addr process_one_req
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
__mutex_unlock_slowpath+0x197/0x650 kernel/locking/mutex.c:937
addr_handler+0x123/0x450 drivers/infiniband/core/cma.c:3520
process_one_req+0x12b/0x620 drivers/infiniband/core/addr.c:646
process_one_work+0x902/0x1a30 kernel/workqueue.c:3267
process_scheduled_works kernel/workqueue.c:3348 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>

Allocated by task 31293:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc include/linux/slab.h:628 [inline]
kzalloc include/linux/slab.h:749 [inline]
__rdma_create_id+0x5b/0x630 drivers/infiniband/core/cma.c:993
__rdma_create_kernel_id+0x3c/0x90 drivers/infiniband/core/cma.c:1033
rdma_create_trans+0x9a5/0x15b0 net/9p/trans_rdma.c:657
p9_client_create+0x81a/0x11b0 net/9p/client.c:1012
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xaa0 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 31293:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2111 [inline]
slab_free mm/slub.c:4286 [inline]
kfree+0x129/0x3a0 mm/slub.c:4396
rdma_destroy_trans+0x186/0x210 net/9p/trans_rdma.c:377
rdma_create_trans+0x11dc/0x15b0 net/9p/trans_rdma.c:743
p9_client_create+0x81a/0x11b0 net/9p/client.c:1012
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xaa0 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff8880110f1000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 964 bytes inside of
freed 2048-byte region [ffff8880110f1000, ffff8880110f1800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110f0
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888014c42f00 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
head: 00fff00000000840 ffff888014c42f00 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
head: 00fff00000000003 ffffea0000443c01 dead000000000122 00000000ffffffff
head: 0000000800000000 0000000000000000 00000000ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 31006, tgid 31005 (syz-executor.2), ts 1005192695362, free_ts 1005113826857
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
prep_new_page mm/page_alloc.c:1541 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
__alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2180 [inline]
allocate_slab mm/slub.c:2343 [inline]
new_slab+0xcc/0x3a0 mm/slub.c:2396
___slab_alloc+0x670/0x16d0 mm/slub.c:3530
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3615
__slab_alloc_node mm/slub.c:3668 [inline]
slab_alloc_node mm/slub.c:3841 [inline]
__do_kmalloc_node mm/slub.c:3971 [inline]
__kmalloc+0x3bf/0x440 mm/slub.c:3985
kmalloc include/linux/slab.h:632 [inline]
sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2080
sk_alloc+0x36/0xb90 net/core/sock.c:2133
__netlink_create+0x63/0x300 net/netlink/af_netlink.c:647
netlink_create+0x3dc/0x670 net/netlink/af_netlink.c:708
__sock_create+0x32e/0x800 net/socket.c:1571
sock_create net/socket.c:1622 [inline]
__sys_socket_create net/socket.c:1659 [inline]
__sys_socket+0x14f/0x260 net/socket.c:1706
__do_sys_socket net/socket.c:1720 [inline]
__se_sys_socket net/socket.c:1718 [inline]
__ia32_sys_socket+0x72/0xb0 net/socket.c:1718
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
page last free pid 30994 tgid 30993 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1141 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487
__folio_put_large mm/swap.c:132 [inline]
__folio_put+0x210/0x290 mm/swap.c:140
bpf_check+0x1c42/0xb970 kernel/bpf/verifier.c:21433
bpf_prog_load+0xe3f/0x2670 kernel/bpf/syscall.c:2895
__sys_bpf+0x9cb/0x58b0 kernel/bpf/syscall.c:5660
__do_sys_bpf kernel/bpf/syscall.c:5767 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5765 [inline]
__ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5765
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Memory state around the buggy address:
ffff8880110f1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880110f1300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880110f1380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880110f1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880110f1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


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