================================================================== 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+0x578/0x960 sound/core/oss/linear.c:110 Read of size 1 at addr ffff880090f721c0 by task syz-executor.0/14703 CPU: 0 PID: 14703 Comm: syz-executor.0 Not tainted 4.20.0-rc1-syzkaller #0 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+0x16b/0x224 lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 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+0x578/0x960 sound/core/oss/linear.c:110 snd_pcm_plug_read_transfer+0x151/0x290 sound/core/oss/pcm_plugin.c:651 snd_pcm_oss_read2+0x1a9/0x470 sound/core/oss/pcm_oss.c:1474 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1531 [inline] snd_pcm_oss_read+0x416/0x610 sound/core/oss/pcm_oss.c:2752 __vfs_read+0xe3/0x880 fs/read_write.c:416 vfs_read+0xf5/0x2f0 fs/read_write.c:452 ksys_read+0xcd/0x1b0 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x6e/0xb0 fs/read_write.c:586 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc287d81c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000000001000 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc287d826d4 R13: 00000000004c8aa0 R14: 00000000004e0190 R15: 00000000ffffffff Allocated by task 14703: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node+0x50/0x70 mm/slab.c:3691 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x68/0x70 mm/util.c:416 kvmalloc include/linux/mm.h:577 [inline] kvzalloc include/linux/mm.h:585 [inline] snd_pcm_plugin_alloc+0x445/0x8d0 sound/core/oss/pcm_plugin.c:70 snd_pcm_plug_alloc+0x106/0x270 sound/core/oss/pcm_plugin.c:129 snd_pcm_oss_change_params_locked+0x1a82/0x3170 sound/core/oss/pcm_oss.c:1038 snd_pcm_oss_change_params+0x54/0xa0 sound/core/oss/pcm_oss.c:1101 snd_pcm_oss_get_active_substream.part.28+0xdd/0x160 sound/core/oss/pcm_oss.c:1118 snd_pcm_oss_get_active_substream sound/core/oss/pcm_oss.c:1111 [inline] 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+0x1a40/0x2fb0 sound/core/oss/pcm_oss.c:2608 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 13204: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x220 mm/slab.c:3817 load_elf_binary+0x1b57/0x4e00 fs/binfmt_elf.c:1117 search_binary_handler+0x12b/0x630 fs/exec.c:1653 exec_binprm fs/exec.c:1695 [inline] __do_execve_file.isra.32+0x1167/0x1e60 fs/exec.c:1819 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8a/0xb0 fs/exec.c:1959 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff880090f72040 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 384 bytes inside of 512-byte region [ffff880090f72040, ffff880090f72240) The buggy address belongs to the page: page:ffffea000243dc80 count:1 mapcount:0 mapping:ffff88012c2a0940 index:0xffff880090f72a40 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000240f608 ffffea000242d7c8 ffff88012c2a0940 raw: ffff880090f72a40 ffff880090f72040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880090f72080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff880090f72100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff880090f72180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff880090f72200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880090f72280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================