================================================================== 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 ffff0000d5958d99 by task syz.9.925/8241 CPU: 0 PID: 8241 Comm: syz.9.925 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 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_release+0x120/0x14c sound/core/pcm_native.c:2939 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:000000005c676751 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115958 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc00040d3f08 ffff00019f3890b0 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d5958c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000d5958d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000d5958d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000d5958e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000d5958e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8241 at mm/slab_common.c:904 free_large_kmalloc+0x30/0x158 mm/slab_common.c:905 Modules linked in: CPU: 0 PID: 8241 Comm: syz.9.925 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 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 : ffff800021f17840 x29: ffff800021f17840 x28: ffff0000f33a1110 x27: 1ffff00002d3b3a4 x26: 1fffe0001ab2b11e x25: 1fffe0001ab2b125 x24: 000000000000000d x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000040000 x20: ffff0000d5958080 x19: fffffc0003565600 x18: 1fffe00033e6df7e x17: 0000000000000000 x16: ffff800011b9ccb8 x15: 0000000000000000 x14: 0000000000000001 x13: 1ffff00002ff436c x12: 0000000000000000 x11: ff0080000808d058 x10: ffffffffffffffff x9 : 0000000000000000 x8 : ffff800017d7e000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021f17278 x4 : ffff800015484e80 x3 : ffff800008195a38 x2 : 0000000000000001 x1 : ffff0000d5958080 x0 : fffffc0003565600 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_release+0x120/0x14c sound/core/pcm_native.c:2939 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: 15619 hardirqs last enabled at (15619): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline] hardirqs last enabled at (15619): [] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005 hardirqs last disabled at (15618): [] __schedule+0x294/0x1a6c kernel/sched/core.c:6461 softirqs last enabled at (12886): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (12884): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- object pointer: 0x000000002cad988a