netdevsim netdevsim1: Falling back to sysfs fallback for: / ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x36/0xc0 lib/list_debug.c:23 Read of size 8 at addr ffff88801b7b70c8 by task syz-executor.1/985 CPU: 1 PID: 985 Comm: syz-executor.1 Not tainted 5.14.0-rc4-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+0x1ae/0x29f lib/dump_stack.c:105 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 __list_add_valid+0x36/0xc0 lib/list_debug.c:23 __list_add include/linux/list.h:67 [inline] list_add include/linux/list.h:86 [inline] fw_load_sysfs_fallback+0x110/0x720 drivers/base/firmware_loader/fallback.c:516 fw_load_from_user_helper+0x242/0x320 drivers/base/firmware_loader/fallback.c:581 _request_firmware+0x3b4/0x560 drivers/base/firmware_loader/main.c:833 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:877 devlink_compat_flash_update+0x209/0x420 net/core/devlink.c:11220 ethtool_flash_device+0x150/0x1c0 net/ethtool/ioctl.c:2072 dev_ethtool+0x2160/0x7bc0 net/ethtool/ioctl.c:2765 dev_ioctl+0x251/0xb90 net/core/dev_ioctl.c:440 sock_do_ioctl+0x227/0x300 net/socket.c:1117 sock_ioctl+0x444/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7ec0732188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000100 RSI: 0000000000008946 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe343f001f R14: 00007f7ec0732300 R15: 0000000000022000 Allocated by task 971: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xc4/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2983 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] __allocate_fw_priv+0x98/0x330 drivers/base/firmware_loader/main.c:187 alloc_lookup_fw_priv+0x1c0/0x380 drivers/base/firmware_loader/main.c:251 _request_firmware_prepare+0x27c/0x630 drivers/base/firmware_loader/main.c:746 _request_firmware+0x11b/0x560 drivers/base/firmware_loader/main.c:808 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:877 devlink_compat_flash_update+0x209/0x420 net/core/devlink.c:11220 ethtool_flash_device+0x150/0x1c0 net/ethtool/ioctl.c:2072 dev_ethtool+0x2160/0x7bc0 net/ethtool/ioctl.c:2765 dev_ioctl+0x251/0xb90 net/core/dev_ioctl.c:440 sock_do_ioctl+0x227/0x300 net/socket.c:1117 sock_ioctl+0x444/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 971: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xd0/0x1f0 mm/slub.c:4264 kref_put include/linux/kref.h:65 [inline] free_fw_priv drivers/base/firmware_loader/main.c:290 [inline] firmware_free_data drivers/base/firmware_loader/main.c:586 [inline] release_firmware+0x139/0x1b0 drivers/base/firmware_loader/main.c:1055 _request_firmware+0x408/0x560 drivers/base/firmware_loader/main.c:841 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:877 devlink_compat_flash_update+0x209/0x420 net/core/devlink.c:11220 ethtool_flash_device+0x150/0x1c0 net/ethtool/ioctl.c:2072 dev_ethtool+0x2160/0x7bc0 net/ethtool/ioctl.c:2765 dev_ioctl+0x251/0xb90 net/core/dev_ioctl.c:440 sock_do_ioctl+0x227/0x300 net/socket.c:1117 sock_ioctl+0x444/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 insert_work+0x54/0x400 kernel/workqueue.c:1332 __queue_work+0x928/0xc60 kernel/workqueue.c:1498 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1419 expire_timers kernel/time/timer.c:1459 [inline] __run_timers+0x74e/0x910 kernel/time/timer.c:1732 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1745 __do_softirq+0x372/0x783 kernel/softirq.c:558 Second to last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 kvfree_call_rcu+0x114/0x8a0 kernel/rcu/tree.c:3594 drop_sysctl_table+0x2cd/0x430 fs/proc/proc_sysctl.c:1647 drop_sysctl_table+0x2eb/0x430 fs/proc/proc_sysctl.c:1650 unregister_sysctl_table+0x88/0x130 fs/proc/proc_sysctl.c:1685 lowpan_frags_ns_sysctl_unregister net/ieee802154/6lowpan/reassembly.c:402 [inline] lowpan_frags_exit_net+0x5c/0xb0 net/ieee802154/6lowpan/reassembly.c:475 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x758/0xc60 net/core/net_namespace.c:595 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88801b7b7000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes inside of 256-byte region [ffff88801b7b7000, ffff88801b7b7100) The buggy address belongs to the page: page:ffffea00006ded80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b7b6 head:ffffea00006ded80 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00008a6480 0000000300000003 ffff888011041b40 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 6014114431, free_ts 0 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2119 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2800 __slab_alloc mm/slub.c:2840 [inline] slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] __kmalloc+0x2e7/0x390 mm/slub.c:4108 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:660 [inline] __list_lru_init+0xaf/0x9e0 mm/list_lru.c:596 alloc_super+0x72b/0x860 fs/super.c:274 sget_fc+0x257/0x660 fs/super.c:531 vfs_get_super fs/super.c:1135 [inline] get_tree_nodev+0x26/0x160 fs/super.c:1170 vfs_get_tree+0x86/0x270 fs/super.c:1498 fc_mount fs/namespace.c:993 [inline] vfs_kern_mount+0xc9/0x160 fs/namespace.c:1023 kern_mount+0x3f/0x90 fs/namespace.c:4266 aio_setup+0x11/0x8a fs/aio.c:271 do_one_initcall+0x197/0x3f0 init/main.c:1282 do_initcall_level+0x14a/0x1f5 init/main.c:1355 page_owner free stack trace missing Memory state around the buggy address: ffff88801b7b6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801b7b7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801b7b7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801b7b7100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801b7b7180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================