==================================================================
BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1522 [inline]
BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read+0x7cf/0x1b80 sound/core/oss/pcm_oss.c:2752
CPU: 1 PID: 15435 Comm: syz-executor2 Not tainted 4.18.0-rc4+ #25
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:1092
 kmsan_internal_check_memory+0x18e/0x210 mm/kmsan/kmsan.c:1156
 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1522 [inline]
 snd_pcm_oss_read+0x7cf/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455a79
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ffb413f8c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007ffb413f96d4 RCX: 0000000000455a79
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c090d R14: 00000000004d0db8 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:271 [inline]
 kmsan_internal_chain_origin+0x13c/0x240 mm/kmsan/kmsan.c:683
 __msan_chain_origin+0x76/0xd0 mm/kmsan/kmsan_instr.c:483
 mulaw_encode+0x97b/0xc30 sound/core/oss/mulaw.c:241
 mulaw_transfer+0x1c8/0x250 sound/core/oss/mulaw.c:273
 snd_pcm_plug_read_transfer+0x921/0xb10 sound/core/oss/pcm_plugin.c:650
 snd_pcm_oss_read2 sound/core/oss/pcm_oss.c:1474 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1512 [inline]
 snd_pcm_oss_read+0xe2c/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:271 [inline]
 kmsan_internal_chain_origin+0x13c/0x240 mm/kmsan/kmsan.c:683
 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:397
 __msan_memcpy+0xe7/0x150 mm/kmsan/kmsan_instr.c:432
 cvt_native_to_s16 sound/core/oss/mulaw.c:206 [inline]
 mulaw_encode+0x5e0/0xc30 sound/core/oss/mulaw.c:240
 mulaw_transfer+0x1c8/0x250 sound/core/oss/mulaw.c:273
 snd_pcm_plug_read_transfer+0x921/0xb10 sound/core/oss/pcm_plugin.c:650
 snd_pcm_oss_read2 sound/core/oss/pcm_oss.c:1474 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1512 [inline]
 snd_pcm_oss_read+0xe2c/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x157/0x730 mm/kmsan/kmsan.c:804
 kmsan_alloc_page+0x80/0xe0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0x105b/0x6320 mm/page_alloc.c:4409
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __vmalloc_area_node mm/vmalloc.c:1689 [inline]
 __vmalloc_node_range+0x8bf/0x1170 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1799 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1813 [inline]
 vmalloc+0xd8/0xf0 mm/vmalloc.c:1835
 snd_pcm_plugin_alloc+0x29a/0xc70 sound/core/oss/pcm_plugin.c:70
 snd_pcm_plug_alloc+0x281/0x5d0 sound/core/oss/pcm_plugin.c:129
 snd_pcm_oss_change_params_locked+0x5c23/0x6bf0 sound/core/oss/pcm_oss.c:1038
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1183 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1507 [inline]
 snd_pcm_oss_read+0x4d0/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 0-188 of 189 are uninitialized
Memory access starts at ffffc90011f4b000
==================================================================