================================================================== BUG: KASAN: slab-out-of-bounds in __list_add_valid_or_report+0xe4/0x100 lib/list_debug.c:32 Read of size 8 at addr ffff88810bf68250 by task kworker/1:3/5236 CPU: 1 UID: 0 PID: 5236 Comm: kworker/1:3 Not tainted 6.12.0-rc6-syzkaller-00153-g237d4e0f4113 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: events request_module_async Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 __list_add_valid_or_report+0xe4/0x100 lib/list_debug.c:32 __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add_tail include/linux/list.h:183 [inline] em28xx_init_extension+0x48/0x200 drivers/media/usb/em28xx/em28xx-core.c:1114 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 2848: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_node_track_caller_noprof+0x1ff/0x3e0 mm/slub.c:4283 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2883 unix_dgram_sendmsg+0x467/0x1920 net/unix/af_unix.c:2027 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] __sys_sendto+0x479/0x4d0 net/socket.c:2214 __do_sys_sendto net/socket.c:2226 [inline] __se_sys_sendto net/socket.c:2222 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2222 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 2841: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x37/0x50 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x130/0x480 mm/slub.c:4727 skb_kfree_head net/core/skbuff.c:1086 [inline] skb_free_head+0x108/0x1d0 net/core/skbuff.c:1098 skb_release_data+0x760/0x910 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb net/core/skbuff.c:1204 [inline] consume_skb net/core/skbuff.c:1436 [inline] consume_skb+0xbf/0x100 net/core/skbuff.c:1430 __unix_dgram_recvmsg+0x81c/0xdd0 net/unix/af_unix.c:2520 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2537 sock_recvmsg_nosec net/socket.c:1051 [inline] sock_recvmsg+0x1f6/0x250 net/socket.c:1073 sock_read_iter+0x2bb/0x3b0 net/socket.c:1143 new_sync_read fs/read_write.c:488 [inline] vfs_read+0xa4c/0xbe0 fs/read_write.c:569 ksys_read+0x1fa/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88810bf68000 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 80 bytes to the right of allocated 512-byte region [ffff88810bf68000, ffff88810bf68200) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10bf68 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8881193e5f01 flags: 0x200000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0200000000000040 ffff88810004f140 ffffea0004754800 0000000000000002 raw: 0000000000000000 0000000000100010 00000001f5000000 ffff8881193e5f01 head: 0200000000000040 ffff88810004f140 ffffea0004754800 0000000000000002 head: 0000000000000000 0000000000100010 00000001f5000000 ffff8881193e5f01 head: 0200000000000002 ffffea00042fda01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12488, tgid 12488 (udevd), ts 696481991506, free_ts 695044652493 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0xd6b/0x2660 mm/page_alloc.c:3457 __alloc_pages_noprof+0x221/0x2270 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0xeb/0x400 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xd45/0x1760 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_node_track_caller_noprof+0x14e/0x3e0 mm/slub.c:4283 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2883 unix_dgram_sendmsg+0x467/0x1920 net/unix/af_unix.c:2027 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] sock_write_iter+0x4fe/0x5b0 net/socket.c:1165 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:683 ksys_write+0x1fa/0x260 fs/read_write.c:736 page last free pid 5236 tgid 5236 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x58a/0xb50 mm/page_alloc.c:2638 __folio_put+0x1cd/0x250 mm/swap.c:126 em28xx_free_device drivers/media/usb/em28xx/em28xx-cards.c:3566 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_usb_disconnect+0x4e0/0x610 drivers/media/usb/em28xx/em28xx-cards.c:4204 usb_unbind_interface+0x1e2/0x960 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x122/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1273 [inline] device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1296 bus_remove_device+0x22f/0x420 drivers/base/bus.c:576 device_del+0x396/0x9f0 drivers/base/core.c:3861 usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1418 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2304 hub_port_connect drivers/usb/core/hub.c:5361 [inline] hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] port_event drivers/usb/core/hub.c:5821 [inline] hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5903 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88810bf68100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810bf68180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810bf68200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88810bf68280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810bf68300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================