Memory cgroup out of memory: Killed process 4440 (syz.0.17) total-vm:44920kB, anon-rss:1320kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:76kB oom_score_adj:1000
udc dummy_udc.0: failed to start USB Gadget filesystem: -12
gadgetfs: probe of gadget.0 failed with error -12
udc dummy_udc.1: failed to start USB Gadget filesystem: -12
gadgetfs: probe of gadget.1 failed with error -12
==================================================================
BUG: KASAN: use-after-free in gadgetfs_bind+0xcf/0x820 drivers/usb/gadget/legacy/inode.c:1677
Write of size 8 at addr ffff88807b05e0c0 by task syz.0.17/4440

CPU: 0 PID: 4440 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 gadgetfs_bind+0xcf/0x820 drivers/usb/gadget/legacy/inode.c:1677
 gadget_bind_driver+0x2af/0x760 drivers/usb/gadget/udc/core.c:1651
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834
 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220
 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303
 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620
 driver_register+0x32d/0x430 drivers/base/driver.c:246
 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1730
 dev_config+0xe45/0x1260 drivers/usb/gadget/legacy/inode.c:1878
 vfs_write+0x2dc/0x9a0 fs/read_write.c:582
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8c8b39e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4c00db58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8c8b625fa0 RCX: 00007f8c8b39e159
RDX: 000000000000001f RSI: 0000200000000400 RDI: 0000000000000003
RBP: 00007f8c8b435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c8b625fac R14: 00007f8c8b625fa0 R15: 00007f8c8b625fa0
 </TASK>

Allocated by task 4374:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 dev_new drivers/usb/gadget/legacy/inode.c:170 [inline]
 gadgetfs_fill_super+0x30d/0x610 drivers/usb/gadget/legacy/inode.c:2049
 vfs_get_super fs/super.c:1222 [inline]
 get_tree_single+0xb5/0x160 fs/super.c:1260
 vfs_get_tree+0x88/0x270 fs/super.c:1584
 do_new_mount+0x247/0xa40 fs/namespace.c:3078
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 4440:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xb6/0x200 mm/slub.c:3700
 gadgetfs_bind+0x6d2/0x820 drivers/usb/gadget/legacy/inode.c:1698
 gadget_bind_driver+0x2af/0x760 drivers/usb/gadget/udc/core.c:1651
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834
 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220
 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303
 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620
 driver_register+0x32d/0x430 drivers/base/driver.c:246
 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1730
 dev_config+0xe45/0x1260 drivers/usb/gadget/legacy/inode.c:1878
 vfs_write+0x2dc/0x9a0 fs/read_write.c:582
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88807b05e000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 192 bytes inside of
 1024-byte region [ffff88807b05e000, ffff88807b05e400)

The buggy address belongs to the physical page:
page:ffffea0001ec1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b058
head:ffffea0001ec1600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888017441dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4123, tgid 4123 (sshd-session), ts 59900488758, free_ts 59885567780
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
 prep_new_page mm/page_alloc.c:2567 [inline]
 get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
 alloc_slab_page+0x5d/0x180 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:1997
 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc_node_track_caller+0xa0/0x240 mm/slab_common.c:956
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x226/0x7d0 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1303 [inline]
 __tcp_send_ack+0x9d/0x5a0 net/ipv4/tcp_output.c:4035
 tcp_cleanup_rbuf net/ipv4/tcp.c:1655 [inline]
 tcp_recvmsg_locked+0x1ae0/0x2310 net/ipv4/tcp.c:2694
 tcp_recvmsg+0x213/0x820 net/ipv4/tcp.c:2724
 inet_recvmsg+0x13c/0x1f0 net/ipv4/af_inet.c:890
 sock_recvmsg_nosec net/socket.c:1023 [inline]
 sock_recvmsg net/socket.c:1041 [inline]
 sock_read_iter+0x2da/0x3a0 net/socket.c:1122
 call_read_iter include/linux/fs.h:2265 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x471/0x960 fs/read_write.c:470
 ksys_read+0x14d/0x260 fs/read_write.c:613
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1487 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
 free_slab mm/slub.c:2036 [inline]
 discard_slab mm/slub.c:2042 [inline]
 __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 alloc_buffer_head+0x21/0x100 fs/buffer.c:2903
 alloc_page_buffers+0x326/0x9b0 fs/buffer.c:829
 create_empty_buffers+0x36/0x790 fs/buffer.c:1543
 ext4_block_write_begin+0x338/0x12f0 fs/ext4/inode.c:1108
 ext4_da_write_begin+0x584/0x920 fs/ext4/inode.c:3026
 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862
 ext4_buffered_write_iter+0x112/0x380 fs/ext4/file.c:285

Memory state around the buggy address:
 ffff88807b05df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807b05e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807b05e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807b05e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807b05e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================