linux-kernel - memory leak in snd_pcm_hw

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Date:   Wed, 29 Jan 2020 08:06:14 -0800
From:   syzbot <syzbot+30edd0f34bfcdc548ac4@...kaller.appspotmail.com>
To:     alsa-devel@...a-project.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, perex@...ex.cz,
        sumit.semwal@...aro.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, tiwai@...e.com
Subject: memory leak in snd_pcm_hw_params

Hello,

syzbot found the following crash on:

HEAD commit:    b3a60822 Merge branch 'for-v5.6' of git://git.kernel.org:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1351cf66e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e97a1bc78afb77f
dashboard link: https://syzkaller.appspot.com/bug?extid=30edd0f34bfcdc548ac4
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14e97735e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13cd9bc9e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+30edd0f34bfcdc548ac4@...kaller.appspotmail.com

executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff888108fdefc0 (size 64):
  comm "syz-executor222", pid 7310, jiffies 4294946025 (age 13.660s)
  hex dump (first 32 bytes):
    07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 10 33 02 00 c9 ff ff 00 00 00 00 00 00 00 00  ..3.............
  backtrace:
    [<00000000c59c6b0c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000c59c6b0c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000c59c6b0c>] slab_alloc mm/slab.c:3320 [inline]
    [<00000000c59c6b0c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3549
    [<00000000478172ce>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000478172ce>] kzalloc include/linux/slab.h:670 [inline]
    [<00000000478172ce>] snd_pcm_lib_malloc_pages+0x12b/0x200 sound/core/pcm_memory.c:404
    [<0000000091532e16>] snd_pcm_hw_params+0x720/0x830 sound/core/pcm_native.c:691
    [<000000002070a986>] snd_pcm_kernel_ioctl+0xb5/0x170 sound/core/pcm_native.c:3238
    [<00000000394e99f4>] snd_pcm_oss_change_params_locked+0x745/0x1140 sound/core/oss/pcm_oss.c:944
    [<00000000c81f42ac>] snd_pcm_oss_change_params+0x43/0x80 sound/core/oss/pcm_oss.c:1087
    [<000000007710a1c0>] snd_pcm_oss_make_ready+0x55/0xc0 sound/core/oss/pcm_oss.c:1146
    [<0000000069305204>] snd_pcm_oss_sync.isra.0+0xb8/0x310 sound/core/oss/pcm_oss.c:1707
    [<00000000692460c8>] snd_pcm_oss_release+0xef/0x100 sound/core/oss/pcm_oss.c:2545
    [<0000000013ba02c9>] __fput+0xed/0x300 fs/file_table.c:280
    [<0000000080810f18>] ____fput+0x16/0x20 fs/file_table.c:313
    [<00000000e6bb3aa6>] task_work_run+0x9d/0xc0 kernel/task_work.c:113
    [<00000000b6ce71eb>] exit_task_work include/linux/task_work.h:22 [inline]
    [<00000000b6ce71eb>] do_exit+0x3fa/0xe20 kernel/exit.c:801
    [<0000000045ce7ad3>] do_group_exit+0x4b/0xe0 kernel/exit.c:899
    [<00000000aeb85903>] __do_sys_exit_group kernel/exit.c:910 [inline]
    [<00000000aeb85903>] __se_sys_exit_group kernel/exit.c:908 [inline]
    [<00000000aeb85903>] __x64_sys_exit_group+0x1c/0x20 kernel/exit.c:908
    [<000000008b12db16>] do_syscall_64+0x73/0x220 arch/x86/entry/common.c:294



---
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