[syzbot] [dri?] KASAN: slab-use-after-free Read in drm_atomic_helper_wait_for_vblanks (2)

From: syzbot
Date: Mon Feb 12 2024 - 05:53:04 EST

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Hello,

syzbot found the following issue on:

HEAD commit: a5b6244cf87c Merge tag 'block-6.8-2024-02-10' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15e9ad50180000
kernel config: https://syzkaller.appspot.com/x/.config?x=53985487b59d9442
dashboard link: https://syzkaller.appspot.com/bug?extid=0f999d26a4fd79c3a23b
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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-a5b6244c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/08ca7654741a/vmlinux-a5b6244c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0396d079aa1e/bzImage-a5b6244c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0f999d26a4fd79c3a23b@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-use-after-free in drm_atomic_helper_wait_for_vblanks.part.0+0x84f/0x930 drivers/gpu/drm/drm_atomic_helper.c:1661
Read of size 1 at addr ffff888026066009 by task kworker/u16:8/1094

CPU: 2 PID: 1094 Comm: kworker/u16:8 Not tainted 6.8.0-rc3-syzkaller-00293-ga5b6244cf87c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound commit_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:488
kasan_report+0xda/0x110 mm/kasan/report.c:601
drm_atomic_helper_wait_for_vblanks.part.0+0x84f/0x930 drivers/gpu/drm/drm_atomic_helper.c:1661
drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1657 [inline]
drm_atomic_helper_commit_tail+0xcb/0xf0 drivers/gpu/drm/drm_atomic_helper.c:1757
commit_tail+0x356/0x410 drivers/gpu/drm/drm_atomic_helper.c:1834
process_one_work+0x889/0x15e0 kernel/workqueue.c:2633
process_scheduled_works kernel/workqueue.c:2706 [inline]
worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
kthread+0x2c6/0x3b0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
</TASK>

Allocated by task 16480:
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:372 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:389
kmalloc include/linux/slab.h:590 [inline]
drm_atomic_helper_crtc_duplicate_state+0x70/0xd0 drivers/gpu/drm/drm_atomic_state_helper.c:177
drm_atomic_get_crtc_state+0x162/0x440 drivers/gpu/drm/drm_atomic.c:362
page_flip_common+0x57/0x320 drivers/gpu/drm/drm_atomic_helper.c:3629
drm_atomic_helper_page_flip+0xb6/0x190 drivers/gpu/drm/drm_atomic_helper.c:3690
drm_mode_page_flip_ioctl+0x103f/0x1470 drivers/gpu/drm/drm_plane.c:1489
drm_ioctl_kernel+0x1ec/0x3e0 drivers/gpu/drm/drm_ioctl.c:744
drm_ioctl+0x5d8/0xc00 drivers/gpu/drm/drm_ioctl.c:841
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x193/0x220 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77

Freed by task 16474:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640
poison_slab_object mm/kasan/common.c:241 [inline]
__kasan_slab_free+0x121/0x1c0 mm/kasan/common.c:257
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kfree+0x124/0x370 mm/slub.c:4409
drm_atomic_state_default_clear+0x3aa/0xde0 drivers/gpu/drm/drm_atomic.c:225
drm_atomic_state_clear drivers/gpu/drm/drm_atomic.c:294 [inline]
__drm_atomic_state_free+0x185/0x2b0 drivers/gpu/drm/drm_atomic.c:311
kref_put include/linux/kref.h:65 [inline]
drm_atomic_state_put include/drm/drm_atomic.h:490 [inline]
drm_client_modeset_commit_atomic+0x6db/0x810 drivers/gpu/drm/drm_client_modeset.c:1057
drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1154
drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1180
__drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline]
__drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:230 [inline]
drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline]
drm_fb_helper_lastclose+0xc7/0x160 drivers/gpu/drm/drm_fb_helper.c:2005
drm_fbdev_generic_client_restore+0x2c/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258
drm_client_dev_restore+0x188/0x2a0 drivers/gpu/drm/drm_client.c:247
drm_release+0x32f/0x3e0 drivers/gpu/drm/drm_file.c:437
__fput+0x270/0xb80 fs/file_table.c:376
__fput_sync+0x47/0x50 fs/file_table.c:461
__do_sys_close fs/open.c:1554 [inline]
__se_sys_close fs/open.c:1539 [inline]
__x64_sys_close+0x87/0x100 fs/open.c:1539
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77

The buggy address belongs to the object at ffff888026066000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 9 bytes inside of
freed 512-byte region [ffff888026066000, ffff888026066200)

The buggy address belongs to the physical page:
page:ffffea0000981900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26064
head:ffffea0000981900 order:2 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 ffff888014c42c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 28, tgid 28 (kworker/1:0), ts 50737339083, free_ts 50338469746
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2190 [inline]
allocate_slab mm/slub.c:2354 [inline]
new_slab+0xcc/0x3a0 mm/slub.c:2407
___slab_alloc+0x4af/0x19a0 mm/slub.c:3540
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625
__slab_alloc_node mm/slub.c:3678 [inline]
slab_alloc_node mm/slub.c:3850 [inline]
kmalloc_trace+0x30b/0x340 mm/slub.c:4007
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
mca_alloc net/ipv6/mcast.c:880 [inline]
__ipv6_dev_mc_inc+0x2b7/0xc50 net/ipv6/mcast.c:936
addrconf_join_solict net/ipv6/addrconf.c:2192 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4037 [inline]
addrconf_dad_work+0x232/0x14c0 net/ipv6/addrconf.c:4162
process_one_work+0x889/0x15e0 kernel/workqueue.c:2633
process_scheduled_works kernel/workqueue.c:2706 [inline]
worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
kthread+0x2c6/0x3b0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
page last free pid 5180 tgid 5180 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346
free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
qlink_free mm/kasan/quarantine.c:160 [inline]
qlist_free_all+0x58/0x150 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:324
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3813 [inline]
slab_alloc_node mm/slub.c:3860 [inline]
kmalloc_trace+0x148/0x340 mm/slub.c:4007
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
ref_tracker_alloc+0x17c/0x5b0 lib/ref_tracker.c:203
__netdev_tracker_alloc include/linux/netdevice.h:4147 [inline]
netdev_hold include/linux/netdevice.h:4176 [inline]
netdev_hold include/linux/netdevice.h:4171 [inline]
netdev_queue_add_kobject net/core/net-sysfs.c:1703 [inline]
netdev_queue_update_kobjects+0x1b3/0x520 net/core/net-sysfs.c:1758
register_queue_kobjects net/core/net-sysfs.c:1819 [inline]
netdev_register_kobject+0x290/0x3f0 net/core/net-sysfs.c:2059
register_netdevice+0x1392/0x1db0 net/core/dev.c:10261
geneve_configure+0x6a7/0xa10 drivers/net/geneve.c:1366
geneve_newlink+0x12f/0x2b0 drivers/net/geneve.c:1617
rtnl_newlink_create net/core/rtnetlink.c:3515 [inline]
__rtnl_newlink+0x1197/0x1960 net/core/rtnetlink.c:3735
rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3748
rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6615
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543

Memory state around the buggy address:
ffff888026065f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888026065f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888026066000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888026066080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888026066100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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