KASAN: slab-out-of-bounds Read in resample_shrink

From: syzbot
Date: Fri Mar 06 2020 - 03:55:15 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=110662f9e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
dashboard link: https://syzkaller.appspot.com/bug?extid=e1fe9f44fb8ecf4fb5dd
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160e2e91e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=125f09fde00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e1fe9f44fb8ecf4fb5dd@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-out-of-bounds in resample_shrink+0x4cd/0x820 sound/core/oss/rate.c:160
Read of size 2 at addr ffff8880940b8a00 by task syz-executor858/9001

CPU: 0 PID: 9001 Comm: syz-executor858 Not tainted 5.6.0-rc3-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+0x1fb/0x318 lib/dump_stack.c:118
print_address_description+0x74/0x5c0 mm/kasan/report.c:374
__kasan_report+0x149/0x1c0 mm/kasan/report.c:506
kasan_report+0x26/0x50 mm/kasan/common.c:641
__asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:133
resample_shrink+0x4cd/0x820 sound/core/oss/rate.c:160
rate_transfer+0x51c/0x620 sound/core/oss/rate.c:279
snd_pcm_plug_read_transfer+0x1cc/0x270 sound/core/oss/pcm_plugin.c:651
snd_pcm_oss_read2 sound/core/oss/pcm_oss.c:1460 [inline]
snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1517 [inline]
snd_pcm_oss_read+0x7a6/0xd70 sound/core/oss/pcm_oss.c:2741
do_loop_readv_writev fs/read_write.c:714 [inline]
do_iter_read+0x4a2/0x5b0 fs/read_write.c:935
vfs_readv fs/read_write.c:1053 [inline]
do_readv+0x18c/0x330 fs/read_write.c:1090
__do_sys_readv fs/read_write.c:1181 [inline]
__se_sys_readv fs/read_write.c:1178 [inline]
__x64_sys_readv+0x7d/0x90 fs/read_write.c:1178
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4467e9
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe8f541ddb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467e9
RDX: 0000000000000001 RSI: 0000000020395000 RDI: 0000000000000003
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffdbf15dd2f R14: 00007fe8f541e9c0 R15: 000000000000002d

Allocated by task 9001:
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:515
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
__do_kmalloc_node mm/slab.c:3616 [inline]
__kmalloc_node+0x4d/0x60 mm/slab.c:3623
kmalloc_node include/linux/slab.h:578 [inline]
kvmalloc_node+0x85/0x110 mm/util.c:574
kvmalloc include/linux/mm.h:645 [inline]
kvzalloc include/linux/mm.h:653 [inline]
snd_pcm_plugin_alloc+0x167/0x760 sound/core/oss/pcm_plugin.c:70
snd_pcm_plug_alloc+0x193/0x2e0 sound/core/oss/pcm_plugin.c:129
snd_pcm_oss_change_params_locked+0x2b34/0x4350 sound/core/oss/pcm_oss.c:1024
snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1087 [inline]
snd_pcm_oss_get_active_substream+0x22c/0x2a0 sound/core/oss/pcm_oss.c:1104
snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1754 [inline]
snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1746 [inline]
snd_pcm_oss_ioctl+0x1d66/0x4600 sound/core/oss/pcm_oss.c:2593
vfs_ioctl fs/ioctl.c:47 [inline]
ksys_ioctl fs/ioctl.c:763 [inline]
__do_sys_ioctl fs/ioctl.c:772 [inline]
__se_sys_ioctl+0x113/0x190 fs/ioctl.c:770
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:770
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8498:
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:337 [inline]
__kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476
kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
__cache_free mm/slab.c:3426 [inline]
kfree+0x10d/0x220 mm/slab.c:3757
load_elf_binary+0x2c73/0x3440 fs/binfmt_elf.c:1086
search_binary_handler+0x190/0x5e0 fs/exec.c:1662
exec_binprm fs/exec.c:1705 [inline]
__do_execve_file+0x153b/0x1ca0 fs/exec.c:1825
do_execveat_common fs/exec.c:1871 [inline]
do_execve fs/exec.c:1888 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:1959
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880940b8800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes to the right of
512-byte region [ffff8880940b8800, ffff8880940b8a00)
The buggy address belongs to the page:
page:ffffea0002502e00 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002787a08 ffffea00024147c8 ffff8880aa400a80
raw: 0000000000000000 ffff8880940b8000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880940b8900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880940b8980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880940b8a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880940b8a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880940b8b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

---
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Next message: Stanimir Varbanov: "Re: [PATCH v2] media: venus: support frame rate control"
Previous message: Icenowy Zheng: "Re: [PATCH v2 2/2] drm/bridge: anx7688: Add anx7688 bridge driver support"
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