================================================================== BUG: KASAN: use-after-free in snd_card_do_free sound/core/init.c:612 [inline] BUG: KASAN: use-after-free in release_card_device+0x188/0x198 sound/core/init.c:145 Read of size 1 at addr ffff0000d587cd99 by task syz.3.209/5232 CPU: 1 PID: 5232 Comm: syz.3.209 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348 snd_card_do_free sound/core/init.c:612 [inline] release_card_device+0x188/0x198 sound/core/init.c:145 device_release+0x94/0x1b4 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:729 put_device+0x28/0x40 drivers/base/core.c:3820 snd_card_file_remove+0x2e4/0x340 sound/core/init.c:1147 snd_pcm_oss_release+0x1e4/0x230 sound/core/oss/pcm_oss.c:2597 snd_disconnect_release+0x224/0x298 sound/core/init.c:438 __fput+0x1b4/0x7b0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1f4/0x280 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the physical page: page:00000000898d10f0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11587c flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003ba2b08 ffff00019f3ce0b0 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d587cc80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000d587cd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000d587cd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000d587ce00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000d587ce80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5232 at mm/slab_common.c:904 free_large_kmalloc+0x30/0x158 mm/slab_common.c:905 Modules linked in: CPU: 1 PID: 5232 Comm: syz.3.209 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 42400005 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : free_large_kmalloc+0x30/0x158 mm/slab_common.c:905 lr : kfree+0xf4/0x1a8 mm/slab_common.c:982 sp : ffff800020e37830 x29: ffff800020e37830 x28: ffff0000caa1bf10 x27: 1ffff00002d37378 x26: 1fffe0001ab0f91e x25: 1fffe0001ab0f925 x24: 000000000000000d x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000040000 x20: ffff0000d587c080 x19: fffffc0003561f00 x18: 1fffe00033e7697e x17: ffff80001537d000 x16: ffff800011b90080 x15: 0000000040000000 x14: 0000000000000001 x13: 1ffff00002ff016c x12: 0000000000000000 x11: ff0080000808d058 x10: ffffffffffffffff x9 : 0000000000000000 x8 : ffff800017d5d000 x7 : ffff800011cec160 x6 : ffff80000825ab50 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008195a38 x2 : 0000000000000001 x1 : ffff0000d587c080 x0 : fffffc0003561f00 Call trace: free_large_kmalloc+0x30/0x158 mm/slab_common.c:905 kfree+0xf4/0x1a8 mm/slab_common.c:982 snd_card_do_free sound/core/init.c:613 [inline] release_card_device+0x130/0x198 sound/core/init.c:145 device_release+0x94/0x1b4 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:729 put_device+0x28/0x40 drivers/base/core.c:3820 snd_card_file_remove+0x2e4/0x340 sound/core/init.c:1147 snd_pcm_oss_release+0x1e4/0x230 sound/core/oss/pcm_oss.c:2597 snd_disconnect_release+0x224/0x298 sound/core/init.c:438 __fput+0x1b4/0x7b0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1f4/0x280 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 18551 hardirqs last enabled at (18551): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline] hardirqs last enabled at (18551): [] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005 hardirqs last disabled at (18550): [] __schedule+0x294/0x1a6c kernel/sched/core.c:6461 softirqs last enabled at (18428): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (18428): [] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624 softirqs last disabled at (18415): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- object pointer: 0x00000000837825f9