RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003 RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458 ================================================================== BUG: KASAN: slab-use-after-free in vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043 Read of size 8 at addr ffff888032a8af54 by task syz.1.86/6421 CPU: 1 UID: 0 PID: 6421 Comm: syz.1.86 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043 vidtv_channel_si_init+0x15cd/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:491 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239 dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973 dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757 dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050 dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f00d938e9a9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f00da241038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f00d95b5fa0 RCX: 00007f00d938e9a9 RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003 RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458 Allocated by task 6421: 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+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] vidtv_psi_eit_event_init+0xe0/0x3f0 drivers/media/test-drivers/vidtv/vidtv_psi.c:1985 vidtv_channel_eit_event_cat_into_new drivers/media/test-drivers/vidtv/vidtv_channel.c:182 [inline] vidtv_channel_si_init+0x897/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:439 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239 dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973 dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757 dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050 dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6421: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4842 vidtv_psi_eit_event_destroy drivers/media/test-drivers/vidtv/vidtv_psi.c:2045 [inline] vidtv_psi_eit_table_destroy+0x133/0x180 drivers/media/test-drivers/vidtv/vidtv_psi.c:2051 vidtv_channel_si_init+0x163d/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:485 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239 dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973 dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757 dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050 dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888032a8af40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 20 bytes inside of freed 32-byte region [ffff888032a8af40, ffff888032a8af60) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32a8a flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b841780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000400040 00000000f5000000 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 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5565, tgid 5565 (dhcpcd-run-hook), ts 67368240986, free_ts 67310237145 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x23b/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] slab_free_hook mm/slub.c:2333 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x142/0x4d0 mm/slub.c:4745 vms_complete_munmap_vmas+0x573/0x970 mm/vma.c:1288 __mmap_complete mm/vma.c:2519 [inline] __mmap_region+0x8e7/0x25e0 mm/vma.c:2630 mmap_region+0x1ab/0x3f0 mm/vma.c:2692 do_mmap+0xa3e/0x1210 mm/mmap.c:561 vm_mmap_pgoff+0x281/0x450 mm/util.c:579 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 page last free pid 0 tgid 0 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 pagetable_free include/linux/mm.h:2884 [inline] pagetable_dtor_free include/linux/mm.h:2982 [inline] __tlb_remove_table include/asm-generic/tlb.h:220 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2832 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Memory state around the buggy address: ffff888032a8ae00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888032a8ae80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff888032a8af00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff888032a8af80: 00 00 00 05 fc fc fc fc 00 00 05 fc fc fc fc fc ffff888032a8b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================