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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline]
BUG: KASAN: slab-out-of-bounds in do_convert sound/core/oss/linear.c:48 [inline]
BUG: KASAN: slab-out-of-bounds in convert sound/core/oss/linear.c:81 [inline]
BUG: KASAN: slab-out-of-bounds in linear_transfer sound/core/oss/linear.c:110 [inline]
BUG: KASAN: slab-out-of-bounds in linear_transfer+0x6de/0x970 sound/core/oss/linear.c:88
Read of size 1 at addr ffff8880931238f8 by task syz-executor.3/22176

CPU: 0 PID: 22176 Comm: syz-executor.3 Not tainted 5.0.0+ #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 memcpy+0x24/0x50 mm/kasan/common.c:132
 memcpy include/linux/string.h:352 [inline]
 do_convert sound/core/oss/linear.c:48 [inline]
 convert sound/core/oss/linear.c:81 [inline]
 linear_transfer sound/core/oss/linear.c:110 [inline]
 linear_transfer+0x6de/0x970 sound/core/oss/linear.c:88
 snd_pcm_plug_read_transfer+0x1a1/0x2f0 sound/core/oss/pcm_plugin.c:651
 snd_pcm_oss_read2+0x1f0/0x3f0 sound/core/oss/pcm_oss.c:1474
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1531 [inline]
 snd_pcm_oss_read+0x53a/0x6a0 sound/core/oss/pcm_oss.c:2751
 __vfs_read+0x8d/0x110 fs/read_write.c:416
 vfs_read+0x194/0x3e0 fs/read_write.c:452
 ksys_read+0xea/0x1f0 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __ia32_sys_read+0x71/0xb0 fs/read_write.c:586
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f58869
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5d120cc EFLAGS: 00000296 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200012c0
RDX: 0000000000001000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 22158:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_kmalloc mm/kasan/common.c:497 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
 __do_kmalloc_node mm/slab.c:3686 [inline]
 __kmalloc_node+0x4e/0x70 mm/slab.c:3693
 kmalloc_node include/linux/slab.h:588 [inline]
 kvmalloc_node+0x68/0x100 mm/util.c:430
 kvmalloc include/linux/mm.h:605 [inline]
 kvzalloc include/linux/mm.h:613 [inline]
 snd_pcm_plugin_alloc+0x585/0x770 sound/core/oss/pcm_plugin.c:70
 snd_pcm_plug_alloc+0x148/0x330 sound/core/oss/pcm_plugin.c:129
 snd_pcm_oss_change_params_locked+0x2118/0x3750 sound/core/oss/pcm_oss.c:1038
 snd_pcm_oss_change_params+0x7b/0xd0 sound/core/oss/pcm_oss.c:1101
 snd_pcm_oss_get_active_substream+0x136/0x190 sound/core/oss/pcm_oss.c:1118
 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1768 [inline]
 snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1760 [inline]
 snd_pcm_oss_ioctl+0x8f7/0x3430 sound/core/oss/pcm_oss.c:2607
 snd_pcm_oss_ioctl_compat+0x24/0x30 sound/core/oss/pcm_oss.c:2734
 __do_compat_sys_ioctl fs/compat_ioctl.c:1052 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:998 [inline]
 __ia32_compat_sys_ioctl+0x197/0x620 fs/compat_ioctl.c:998
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 21010:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3821
 kfree_link+0x16/0x20 fs/libfs.c:1105
 do_delayed_call include/linux/delayed_call.h:28 [inline]
 put_link fs/namei.c:881 [inline]
 step_into fs/namei.c:1770 [inline]
 do_last fs/namei.c:3381 [inline]
 path_openat+0x1ca1/0x46e0 fs/namei.c:3533
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 fs/open.c:1063
 __do_sys_open fs/open.c:1081 [inline]
 __se_sys_open fs/open.c:1076 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1076
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888093122d40
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3000 bytes inside of
 4096-byte region [ffff888093122d40, ffff888093123d40)
The buggy address belongs to the page:
page:ffffea00024c4880 count:1 mapcount:0 mapping:ffff88812c3f0dc0 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000159af08 ffffea0002986188 ffff88812c3f0dc0
raw: 0000000000000000 ffff888093122d40 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888093123780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888093123800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888093123880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
                                                                ^
 ffff888093123900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888093123980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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