================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] BUG: KASAN: slab-out-of-bounds in try_module_get+0x46/0xc0 kernel/module/main.c:954 Write of size 4 at addr ffff88802d850300 by task syz.3.4118/16620 CPU: 1 UID: 0 PID: 16620 Comm: syz.3.4118 Tainted: G Y syzkaller #0 PREEMPT(full) Tainted: [Y]=FORCED_BIND Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:112 [inline] atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] try_module_get+0x46/0xc0 kernel/module/main.c:954 dvb_device_open+0xef/0x340 drivers/media/dvb-core/dvbdev.c:103 chrdev_open+0x4d9/0x600 fs/char_dev.c:413 do_dentry_open+0x80e/0x1360 fs/open.c:1000 vfs_open_consume+0x4a/0x350 fs/open.c:1131 do_open fs/namei.c:4875 [inline] path_openat+0x14a6/0x1da0 fs/namei.c:5040 do_file_open+0x23e/0x4a0 fs/namei.c:5069 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1464 [inline] __se_sys_openat fs/open.c:1459 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1459 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f605f55e9ce Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007f605d7f5b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f605d7f66c0 RCX: 00007f605f55e9ce RDX: 0000000000000000 RSI: 00007f605d7f5c00 RDI: ffffffffffffff9c RBP: 00007f605d7f5c00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f605f826038 R14: 00007f605f825fa0 R15: 00007ffce6d82c08 Allocated by task 5267: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ____ip_mc_inc_group+0x518/0xdb0 net/ipv4/igmp.c:1601 __ip_mc_inc_group net/ipv4/igmp.c:1639 [inline] ip_mc_inc_group net/ipv4/igmp.c:1645 [inline] ip_mc_up+0x115/0x2e0 net/ipv4/igmp.c:1950 inetdev_event+0xe8a/0x1610 net/ipv4/devinet.c:1620 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline] call_netdevice_notifiers net/core/dev.c:2365 [inline] __dev_notify_flags+0x31e/0x510 net/core/dev.c:9934 netif_change_flags+0xde/0x1b0 net/core/dev.c:9963 dev_change_flags+0x128/0x260 net/core/dev_api.c:68 devinet_ioctl+0x966/0x1c50 net/ipv4/devinet.c:1189 inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1007 sock_do_ioctl+0x101/0x320 net/socket.c:1328 sock_ioctl+0x57a/0x7e0 net/socket.c:1449 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802d850200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes to the right of allocated 256-byte region [ffff88802d850200, ffff88802d850300) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d850 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88813ff24b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813ff24b40 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 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, tgid 1 (swapper/0), ts 13888804683 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5471 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x396/0x600 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] bus_add_driver+0x19d/0x6e0 drivers/base/bus.c:755 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_register_driver+0x1e4/0x390 drivers/usb/core/driver.c:1084 do_one_initcall+0x250/0x870 init/main.c:1360 do_initcall_level+0x10a/0x1a0 init/main.c:1422 do_initcalls+0x59/0xa0 init/main.c:1438 kernel_init_freeable+0x29d/0x3e0 init/main.c:1673 kernel_init+0x22/0x1d0 init/main.c:1563 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 page_owner free stack trace missing Memory state around the buggy address: ffff88802d850200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802d850280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802d850300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802d850380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d850400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================