================================================================== BUG: KASAN: slab-use-after-free in dvb_device_open+0xd0/0x250 drivers/media/dvb-core/dvbdev.c:99 Read of size 8 at addr ffff0000ccb6be18 by task syz.0.851/8518 CPU: 0 UID: 0 PID: 8518 Comm: syz.0.851 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 dvb_device_open+0xd0/0x250 drivers/media/dvb-core/dvbdev.c:99 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c8/0x10dc fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x1c4/0x2e4 fs/namei.c:4887 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Allocated by task 1: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2d4/0x624 mm/slub.c:5419 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] dvb_register_device+0x1ac/0x16ec drivers/media/dvb-core/dvbdev.c:472 dvb_register_frontend+0x464/0x698 drivers/media/dvb-core/dvb_frontend.c:3051 vidtv_bridge_dvb_init drivers/media/test-drivers/vidtv/vidtv_bridge.c:438 [inline] vidtv_bridge_probe+0x57c/0xa24 drivers/media/test-drivers/vidtv/vidtv_bridge.c:510 platform_probe+0xfc/0x198 drivers/base/platform.c:1418 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2a8/0x7e8 drivers/base/dd.c:709 __driver_probe_device+0x1e0/0x33c drivers/base/dd.c:871 driver_probe_device+0x6c/0x19c drivers/base/dd.c:901 __driver_attach+0x164/0x374 drivers/base/dd.c:1295 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x4c/0x5c drivers/base/dd.c:1313 bus_add_driver+0x208/0x4fc drivers/base/bus.c:756 driver_register+0x220/0x30c drivers/base/driver.c:249 __platform_driver_register+0x6c/0x80 drivers/base/platform.c:910 vidtv_bridge_init+0x34/0x5c drivers/media/test-drivers/vidtv/vidtv_bridge.c:600 do_one_initcall+0x274/0xc20 init/main.c:1392 do_initcall_level+0x128/0x1c4 init/main.c:1454 do_initcalls+0x70/0xd0 init/main.c:1470 do_basic_setup+0x7c/0x90 init/main.c:1490 kernel_init_freeable+0x268/0x3a8 init/main.c:1703 kernel_init+0x24/0x1dc init/main.c:1593 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Freed by task 8470: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285 kfr kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6250 [inline] kfree+0x188/0x690 mm/slub.c:6565 dvb_free_device drivers/media/dvb-core/dvbdev.c:616 [inline] kref_put include/linux/kref.h:65 [inline] dvb_device_put+0x64/0xd0 drivers/media/dvb-core/dvbdev.c:629 dvb_device_open+0x238/0x250 drivers/media/dvb-core/dvbdev.c:113 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c8/0x10dc fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x284/0x2e4 fs/namei.c:4889 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 The buggy address belongs to the object at ffff0000ccb6be00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 24 bytes inside of freed 256-byte region [ffff0000ccb6be00, ffff0000ccb6bf00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000ccb6ae00 pfn:0x10cb6a head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000240 ffff0000c0001b40 fffffdffc32e0990 fffffdffc3624890 raw: ffff0000ccb6ae00 000000080010000f 00000000f5000000 0000000000000000 head: 05ffc00000000240 ffff0000c0001b40 fffffdffc32e0990 fffffdffc3624890 head: ffff0000ccb6ae00 000000080010000f 00000000f5000000 0000000000000000 head: 05ffc00000000001 fffffdffc332da81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ccb6bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000ccb6bd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000ccb6be00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ccb6be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ccb6bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25, CPU#1: syz.0.851/8518 Modules linked in: CPU: 1 UID: 0 PID: 8518 Comm: syz.0.851 Tainted: G B L syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 lr : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 sp : ffff8000953b7540 x29: ffff8000953b7540 x28: ffff0000ca018748 x27: dfff800000000000 x26: ffff700012a76ebc x25: dfff800000000000 x24: ffff80008726d228 x23: ffff0000ca018748 x22: ffff0000cc565000 x21: 0000000000000000 x20: ffff0000ccb6be10 x19: ffff800089f18000 x18: 1fffe00035c23420 x17: ffff8000888eb000 x16: ffff80008899dba0 x15: ffff0001ae11a10c x14: ffff0001ae11a108 x13: 0000000000000001 x12: 0000000000000000 x11: 000000000000132a x10: 0000000000080000 x9 : 600190f212855200 x8 : 600190f212855200 x7 : 0000000000000000 x6 : ffff80008047caa0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f1374 x2 : 0000000100000000 x1 : ffff0000c90c1d00 x0 : 0000000000000001 Call trace: refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 (P) __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:366 [inline] refcount_inc include/linux/refcount.h:383 [inline] kref_get include/linux/kref.h:45 [inline] dvb_device_get+0x9c/0xbc drivers/media/dvb-core/dvbdev.c:621 dvb_device_open+0x100/0x250 drivers/media/dvb-core/dvbdev.c:106 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c8/0x10dc fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x1c4/0x2e4 fs/namei.c:4887 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 81 hardirqs last enabled at (81): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1644 [inline] hardirqs last enabled at (81): [] finish_lock_switch kernel/sched/core.c:5125 [inline] hardirqs last enabled at (81): [] finish_task_switch+0x22c/0x768 kernel/sched/core.c:5243 hardirqs last disabled at (80): [] __schedule+0x304/0x2dcc kernel/sched/core.c:7043 softirqs last enabled at (28): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (28): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (28): [] do_sve_acc+0x22c/0x3b8 arch/arm64/kernel/fpsimd.c:1360 softirqs last disabled at (26): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (26): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (26): [] do_sve_acc+0x10c/0x3b8 arch/arm64/kernel/fpsimd.c:1346 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28, CPU#1: syz.0.851/8518 Modules linked in: CPU: 1 UID: 0 PID: 8518 Comm: syz.0.851 Tainted: G B W L syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [W]=WARN, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 lr : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 sp : ffff8000953b7420 x29: ffff8000953b7420 x28: ffff0000cc4d0060 x27: 00000000fffffffc x26: ffff0000ccb6be3c x25: ffff0000cc4d0010 x24: ffff0000ca018700 x23: ffff0000cc6cd308 x22: 1fffe0001996d7c7 x21: 00000000c0000000 x20: ffff0000ccb6be10 x19: ffff800089f18000 x18: 1fffe00035c23420 x17: ffff8000888eb000 x16: ffff80008899dba0 x15: ffff0001ae11a10c x14: ffff0001ae11a108 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000001377 x10: 0000000000080000 x9 : 600190f212855200 x8 : 600190f212855200 x7 : 0000000000000000 x6 : ffff80008047caa0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f1374 x2 : 0000000100000000 x1 : ffff0000c90c1d00 x0 : 0000000000000001 Call trace: refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 (P) __refcount_sub_and_test include/linux/refcount.h:400 [inline] __refcount_dec_and_test include/linux/refcount.h:432 [inline] refcount_dec_and_test include/linux/refcount.h:450 [inline] kref_put include/linux/kref.h:64 [inline] dvb_device_put+0xac/0xd0 drivers/media/dvb-core/dvbdev.c:629 dvb_generic_release+0xec/0x154 drivers/media/dvb-core/dvbdev.c:169 dvb_frontend_open+0x9b8/0x105c drivers/media/dvb-core/dvb_frontend.c:2890 dvb_device_open+0x1f4/0x250 drivers/media/dvb-core/dvbdev.c:109 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c8/0x10dc fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x1c4/0x2e4 fs/namei.c:4887 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 81 hardirqs last enabled at (81): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1644 [inline] hardirqs last enabled at (81): [] finish_lock_switch kernel/sched/core.c:5125 [inline] hardirqs last enabled at (81): [] finish_task_switch+0x22c/0x768 kernel/sched/core.c:5243 hardirqs last disabled at (80): [] __schedule+0x304/0x2dcc kernel/sched/core.c:7043 softirqs last enabled at (28): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (28): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (28): [] do_sve_acc+0x22c/0x3b8 arch/arm64/kernel/fpsimd.c:1360 softirqs last disabled at (26): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (26): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (26): [] do_sve_acc+0x10c/0x3b8 arch/arm64/kernel/fpsimd.c:1346 ---[ end trace 0000000000000000 ]---