================================================================== BUG: KASAN: use-after-free in v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] BUG: KASAN: use-after-free in v4l2_fh_open+0xc6/0x430 drivers/media/v4l2-core/v4l2-fh.c:63 Read of size 8 at addr ffff88805a800900 by task v4l_id/6791 CPU: 0 PID: 6791 Comm: v4l_id Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] v4l2_fh_open+0xc6/0x430 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0x152/0x990 drivers/media/usb/em28xx/em28xx-video.c:2163 v4l2_open+0x20b/0x360 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x7ff/0xf80 fs/open.c:826 do_open fs/namei.c:3616 [inline] path_openat+0x2682/0x2f30 fs/namei.c:3750 do_filp_open+0x1b3/0x3e0 fs/namei.c:3777 do_sys_openat2+0x142/0x4a0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc3b7dbc407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc8f84c6f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc3b7cce880 RCX: 00007fc3b7dbc407 RDX: 0000000000000000 RSI: 00007ffc8f84df1c RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffc8f84c940 R14: 00007fc3b854a000 R15: 000055a2cce574d8 The buggy address belongs to the page: page:ffffea00016a0000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a800 head:ffffea00016a0000 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010000(head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 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 0x140cc0(GFP_USER|__GFP_COMP), pid 6794, ts 253260214666, free_ts 252986338087 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 kmalloc_order+0x40/0x150 mm/slab_common.c:986 kmalloc_order_trace+0x14/0xf0 mm/slab_common.c:1002 kmalloc include/linux/slab.h:612 [inline] rxe_pool_init_index drivers/infiniband/sw/rxe/rxe_pool.c:109 [inline] rxe_pool_init+0x348/0x9f0 drivers/infiniband/sw/rxe/rxe_pool.c:147 rxe_init_pools drivers/infiniband/sw/rxe/rxe.c:140 [inline] rxe_init drivers/infiniband/sw/rxe/rxe.c:209 [inline] rxe_add+0xa32/0x1530 drivers/infiniband/sw/rxe/rxe.c:244 rxe_net_add+0x77/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:549 rxe_newlink+0x66/0x100 drivers/infiniband/sw/rxe/rxe.c:272 nldev_newlink+0x485/0x4e0 drivers/infiniband/core/nldev.c:1711 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x69b/0x970 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2500 __sys_sendmsg net/socket.c:2529 [inline] __do_sys_sendmsg net/socket.c:2538 [inline] __se_sys_sendmsg+0x190/0x250 net/socket.c:2536 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 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 mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 stack_depot_save+0x418/0x440 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb3/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 skb_clone+0x1bd/0x350 net/core/skbuff.c:1523 do_one_broadcast net/netlink/af_netlink.c:1457 [inline] netlink_broadcast_filtered+0x630/0x1170 net/netlink/af_netlink.c:1532 netlink_broadcast+0x33/0x40 net/netlink/af_netlink.c:1556 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline] kobject_uevent_net_broadcast+0x364/0x530 lib/kobject_uevent.c:409 kobject_uevent_env+0x556/0x890 lib/kobject_uevent.c:608 device_add+0x91c/0xfb0 drivers/base/core.c:3393 input_register_device+0xa5b/0x1140 drivers/input/input.c:2412 em28xx_register_snapshot_button+0x2d8/0x460 drivers/media/usb/em28xx/em28xx-input.c:610 em28xx_init_buttons drivers/media/usb/em28xx/em28xx-input.c:648 [inline] em28xx_ir_init+0x625/0x1db0 drivers/media/usb/em28xx/em28xx-input.c:715 em28xx_init_extension+0x118/0x1b0 drivers/media/usb/em28xx/em28xx-core.c:1126 Memory state around the buggy address: ffff88805a800800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805a800880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805a800900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88805a800980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805a800a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================