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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:347 [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+0x5db/0x840 sound/core/oss/linear.c:88
Read of size 1 at addr ffff8880a1adfac0 by task syz-executor388/11073

CPU: 0 PID: 11073 Comm: syz-executor388 Not tainted 4.14.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memcpy+0x24/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:347 [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+0x5db/0x840 sound/core/oss/linear.c:88
 snd_pcm_plug_read_transfer+0x158/0x260 sound/core/oss/pcm_plugin.c:650
 snd_pcm_oss_read2+0x1c2/0x370 sound/core/oss/pcm_oss.c:1475
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1532 [inline]
 snd_pcm_oss_read+0x482/0x5d0 sound/core/oss/pcm_oss.c:2753
 __vfs_read+0x105/0x6a0 fs/read_write.c:411
 vfs_read+0x137/0x350 fs/read_write.c:447
 SYSC_read fs/read_write.c:574 [inline]
 SyS_read+0xfd/0x230 fs/read_write.c:567
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x44a759
RSP: 002b:00007f52814f0da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a759
RDX: 0000000000000313 RSI: 0000000020000380 RDI: 0000000000000004
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 0000000020000300 R14: 00000000004aea98 R15: 0000000000000000

Allocated by task 11073:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x51/0x80 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:530 [inline]
 kvmalloc_node+0x4e/0xe0 mm/util.c:397
 kvmalloc include/linux/mm.h:531 [inline]
 kvzalloc include/linux/mm.h:539 [inline]
 snd_pcm_plugin_alloc+0x4da/0x740 sound/core/oss/pcm_plugin.c:70
 snd_pcm_plug_alloc+0x13f/0x300 sound/core/oss/pcm_plugin.c:129
 snd_pcm_oss_change_params_locked+0x1d6e/0x32f0 sound/core/oss/pcm_oss.c:1039
 snd_pcm_oss_change_params+0x63/0xb0 sound/core/oss/pcm_oss.c:1102
 snd_pcm_oss_get_active_substream+0x102/0x150 sound/core/oss/pcm_oss.c:1119
 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1769 [inline]
 snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1761 [inline]
 snd_pcm_oss_ioctl+0xc2e/0x2e50 sound/core/oss/pcm_oss.c:2609
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880a1adfa80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes to the right of
 64-byte region [ffff8880a1adfa80, ffff8880a1adfac0)
The buggy address belongs to the page:
page:ffffea000286b7c0 count:1 mapcount:0 mapping:ffff8880a1adf000 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff8880a1adf000 0000000000000000 0000000100000020
raw: ffffea000280aea0 ffffea00022e11e0 ffff8880aa800340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a1adf980: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff8880a1adfa00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880a1adfa80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880a1adfb00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a1adfb80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
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