================================================================== BUG: KASAN: use-after-free in driver_find drivers/base/driver.c:293 [inline] BUG: KASAN: use-after-free in driver_register+0x352/0x3a0 drivers/base/driver.c:233 Read of size 8 at addr ffff88811cbb5ac8 by task syz-executor.1/22320 CPU: 1 PID: 22320 Comm: syz-executor.1 Not tainted 5.19.0-rc3-syzkaller-00071-g105f3fd2f789 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 driver_find drivers/base/driver.c:293 [inline] driver_register+0x352/0x3a0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7f3456714ec7 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 34 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3455e89098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3455e8a110 RCX: 00007f3456714ec7 RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003 RBP: 0000000000000003 R08: 000000000000ffff R09: 000000000000000b R10: 00007f3455e89140 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000200003c0 R14: 0000000020000000 R15: 0000000000000000 Allocated by task 22298: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc+0x81/0xa0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] bus_add_driver+0xd4/0x640 drivers/base/bus.c:602 driver_register+0x220/0x3a0 drivers/base/driver.c:240 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 Freed by task 22320: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x10f/0x190 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook mm/slub.c:1753 [inline] slab_free mm/slub.c:3507 [inline] kfree+0xc1/0x4f0 mm/slub.c:4555 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 driver_find drivers/base/driver.c:291 [inline] driver_register+0x1e3/0x3a0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 The buggy address belongs to the object at ffff88811cbb5a00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes inside of 256-byte region [ffff88811cbb5a00, ffff88811cbb5b00) The buggy address belongs to the physical page: page:ffffea000472ed00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11cbb4 head:ffffea000472ed00 order:1 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 0000000000000000 dead000000000001 ffff888100041b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 71, tgid 71 (kworker/1:2), ts 285874863393, free_ts 240934406522 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x138c/0x27a0 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x995/0xe10 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] kmem_cache_alloc_trace+0x2fd/0x3b0 mm/slub.c:3253 kmalloc include/linux/slab.h:600 [inline] usb_string+0x10b/0x530 drivers/usb/core/message.c:979 usb_cache_string+0x82/0x140 drivers/usb/core/message.c:1029 usb_enumerate_device drivers/usb/core/hub.c:2408 [inline] usb_new_device+0x15b/0x7d0 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5346 [inline] hub_port_connect_change drivers/usb/core/hub.c:5490 [inline] port_event drivers/usb/core/hub.c:5646 [inline] hub_event+0x25d5/0x4690 drivers/usb/core/hub.c:5728 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2ef/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x537/0xb80 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x5a0 mm/page_alloc.c:3438 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x78/0x80 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x241/0x480 mm/slub.c:3239 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:323 vfs_fstatat+0x73/0xb0 fs/stat.c:254 __do_sys_newfstatat+0x91/0x110 fs/stat.c:425 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+0x46/0xb0 Memory state around the buggy address: ffff88811cbb5980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811cbb5a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811cbb5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811cbb5b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811cbb5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================