==================================================================
BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: null-ptr-deref in do_convert sound/core/oss/linear.c:52 [inline]
BUG: KASAN: null-ptr-deref in convert sound/core/oss/linear.c:81 [inline]
BUG: KASAN: null-ptr-deref in linear_transfer+0x634/0x900 sound/core/oss/linear.c:110
Write of size 2 at addr           (null) by task syz-executor5/28036

CPU: 1 PID: 28036 Comm: syz-executor5 Not tainted 4.15.0-rc9+ #281
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+0x194/0x257 lib/dump_stack.c:53
 kasan_report_error mm/kasan/report.c:349 [inline]
 kasan_report+0x13b/0x340 mm/kasan/report.c:409
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 do_convert sound/core/oss/linear.c:52 [inline]
 convert sound/core/oss/linear.c:81 [inline]
 linear_transfer+0x634/0x900 sound/core/oss/linear.c:110
 snd_pcm_plug_write_transfer+0x24e/0x410 sound/core/oss/pcm_plugin.c:619
 snd_pcm_oss_write2+0x260/0x420 sound/core/oss/pcm_oss.c:1310
 snd_pcm_oss_sync1+0x1cc/0x550 sound/core/oss/pcm_oss.c:1543
 snd_pcm_oss_sync+0x5b6/0x830 sound/core/oss/pcm_oss.c:1617
 snd_pcm_oss_release+0x20b/0x280 sound/core/oss/pcm_oss.c:2444
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16c0 kernel/signal.c:2335
 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fd4480f4ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bf80 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 000000000071bf80 R08: 000000000000002f R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a2f7cf R14: 00007fd4480f59c0 R15: 0000000000000002
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 28036 Comm: syz-executor5 Tainted: G    B            4.15.0-rc9+ #281
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+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 kasan_report_error mm/kasan/report.c:356 [inline]
 kasan_report+0x144/0x340 mm/kasan/report.c:409
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 do_convert sound/core/oss/linear.c:52 [inline]
 convert sound/core/oss/linear.c:81 [inline]
 linear_transfer+0x634/0x900 sound/core/oss/linear.c:110
 snd_pcm_plug_write_transfer+0x24e/0x410 sound/core/oss/pcm_plugin.c:619
 snd_pcm_oss_write2+0x260/0x420 sound/core/oss/pcm_oss.c:1310
 snd_pcm_oss_sync1+0x1cc/0x550 sound/core/oss/pcm_oss.c:1543
 snd_pcm_oss_sync+0x5b6/0x830 sound/core/oss/pcm_oss.c:1617
 snd_pcm_oss_release+0x20b/0x280 sound/core/oss/pcm_oss.c:2444
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16c0 kernel/signal.c:2335
 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fd4480f4ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bf80 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 000000000071bf80 R08: 000000000000002f R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a2f7cf R14: 00007fd4480f59c0 R15: 0000000000000002
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..