================================================================== BUG: KASAN: use-after-free in rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline] BUG: KASAN: use-after-free in rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170 Read of size 8 at addr ffff88811bac0040 by task dhcpcd/1208 CPU: 0 PID: 1208 Comm: dhcpcd Not tainted 5.15.0-syzkaller #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+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline] rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170 rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline] rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394 netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380 __dev_open+0x2bc/0x4d0 net/core/dev.c:1490 __dev_change_flags+0x583/0x750 net/core/dev.c:8790 dev_change_flags+0x93/0x170 net/core/dev.c:8861 devinet_ioctl+0x15d1/0x1ca0 net/ipv4/devinet.c:1144 inet_ioctl+0x1e6/0x320 net/ipv4/af_inet.c:969 sock_do_ioctl+0xcc/0x230 net/socket.c:1118 sock_ioctl+0x2f1/0x640 net/socket.c:1235 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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+0x44/0xae RIP: 0033:0x7fc6a73e40e7 Code: 3c 1c e8 1c ff ff ff 85 c0 79 87 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 61 9d 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007fff0cea63b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc6a72f66c8 RCX: 00007fc6a73e40e7 RDX: 00007fff0ceb65a8 RSI: 0000000000008914 RDI: 0000000000000005 RBP: 00007fff0cec6758 R08: 00007fff0ceb6568 R09: 00007fff0ceb6518 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0ceb65a8 R14: 0000000000000028 R15: 0000000000008914 Allocated by task 4469: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0x7c/0x90 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] _request_firmware_prepare drivers/base/firmware_loader/main.c:732 [inline] _request_firmware+0x192/0x1440 drivers/base/firmware_loader/main.c:808 request_firmware_work_func+0xdd/0x230 drivers/base/firmware_loader/main.c:1079 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x40b/0x500 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 4469: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook mm/slub.c:1726 [inline] slab_free mm/slub.c:3492 [inline] kfree+0xd9/0x470 mm/slub.c:4552 release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053 r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 __device_release_driver+0x5d7/0x700 drivers/base/dd.c:1205 device_release_driver_internal drivers/base/dd.c:1236 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1259 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529 device_del+0x502/0xd60 drivers/base/core.c:3583 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x40b/0x500 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88811bac0040 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff88811bac0040, ffff88811bac0060) The buggy address belongs to the page: page:ffffea00046eb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bac0 flags: 0x200000000000200(slab|node=0|zone=2) raw: 0200000000000200 ffffea00045f12c0 0000000200000002 ffff888100041500 raw: 0000000000000000 0000000000400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3780, ts 96844336639, free_ts 96808275797 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1254/0x2980 mm/page_alloc.c:4155 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381 __alloc_pages_node include/linux/gfp.h:566 [inline] alloc_slab_page mm/slub.c:1772 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0xab/0x490 mm/slub.c:1970 ___slab_alloc+0x8b9/0xfa0 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] __kmalloc_node+0x127/0x350 mm/slub.c:4444 kmalloc_array_node include/linux/slab.h:684 [inline] kcalloc_node include/linux/slab.h:689 [inline] memcg_alloc_page_obj_cgroups+0x87/0x140 mm/memcontrol.c:2795 account_slab_page mm/slab.h:424 [inline] allocate_slab mm/slub.c:1923 [inline] new_slab+0x36f/0x490 mm/slub.c:1970 ___slab_alloc+0x8b9/0xfa0 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] __kmalloc_node+0x127/0x350 mm/slub.c:4444 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x61/0x120 mm/util.c:587 kvmalloc include/linux/mm.h:800 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x7e7/0x1240 fs/seq_file.c:210 kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2155 [inline] new_sync_read+0x421/0x6e0 fs/read_write.c:400 vfs_read+0x35c/0x600 fs/read_write.c:481 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare+0x315/0x710 mm/page_alloc.c:1391 free_unref_page_prepare mm/page_alloc.c:3317 [inline] free_unref_page+0x19/0x580 mm/page_alloc.c:3396 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x73/0x80 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x1d2/0x370 mm/slub.c:3226 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:323 user_path_at_empty+0x2b/0x60 fs/namei.c:2800 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x142/0x390 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat+0x96/0x120 fs/stat.c:412 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+0x44/0xae Memory state around the buggy address: ffff88811babff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811babff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811bac0000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88811bac0080: 00 00 00 02 fc fc fc fc 00 00 00 02 fc fc fc fc ffff88811bac0100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================