================================================================== BUG: KASAN: use-after-free in driver_find drivers/base/driver.c:293 [inline] BUG: KASAN: use-after-free in driver_register+0x2c1/0x3e0 drivers/base/driver.c:233 Read of size 8 at addr ffff88801ddff2c8 by task syz-executor.4/861 CPU: 1 PID: 861 Comm: syz-executor.4 Not tainted 5.19.0-rc2-syzkaller-00241-g4b35035bcf80 #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+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 driver_find drivers/base/driver.c:293 [inline] driver_register+0x2c1/0x3e0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xd9/0x230 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run+0xbd/0x300 drivers/usb/gadget/legacy/raw_gadget.c:515 raw_ioctl+0x163/0xc20 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+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f8b90888ec7 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:00007f8b91a0e098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8b91a0f110 RCX: 00007f8b90888ec7 RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000005 RBP: 0000000000000005 R08: 000000000000ffff R09: 000000000000000b R10: 00007f8b91a0e140 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000300 R14: 0000000020000080 R15: 0000000000000000 Allocated by task 839: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x94/0x310 mm/slub.c:3255 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] bus_add_driver+0xde/0x600 drivers/base/bus.c:602 driver_register+0x2e9/0x3e0 drivers/base/driver.c:240 usb_gadget_register_driver_owner+0xd9/0x230 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run+0xbd/0x300 drivers/usb/gadget/legacy/raw_gadget.c:515 raw_ioctl+0x163/0xc20 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+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 861: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xc6/0x210 mm/slub.c:4555 kobject_cleanup+0x235/0x470 lib/kobject.c:673 driver_find drivers/base/driver.c:291 [inline] driver_register+0x29b/0x3e0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xd9/0x230 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run+0xbd/0x300 drivers/usb/gadget/legacy/raw_gadget.c:515 raw_ioctl+0x163/0xc20 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+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88801ddff200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes inside of 256-byte region [ffff88801ddff200, ffff88801ddff300) The buggy address belongs to the physical page: page:ffffea0000777f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ddfe head:ffffea0000777f80 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00007aa580 dead000000000002 ffff888011c41b40 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 25, tgid 25 (kdevtmpfs), ts 6127559072, free_ts 0 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_slab_page+0x70/0xf0 mm/slub.c:1797 allocate_slab+0x5e/0x520 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3002 __slab_alloc mm/slub.c:3089 [inline] slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] kmem_cache_alloc_trace+0x25c/0x310 mm/slub.c:3253 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] smk_fetch+0x91/0x140 security/smack/smack_lsm.c:290 smack_d_instantiate+0x741/0xa10 security/smack/smack_lsm.c:3453 security_d_instantiate+0xa5/0x100 security/security.c:2050 d_instantiate+0x51/0x90 fs/dcache.c:2034 shmem_mknod+0x165/0x1b0 mm/shmem.c:2864 vfs_mknod+0x3a8/0x440 fs/namei.c:3853 handle_create drivers/base/devtmpfs.c:226 [inline] handle drivers/base/devtmpfs.c:391 [inline] devtmpfs_work_loop+0x9cc/0x10c0 drivers/base/devtmpfs.c:406 devtmpfsd+0x44/0x50 drivers/base/devtmpfs.c:448 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff88801ddff180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801ddff200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ddff280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ddff300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801ddff380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================