ALSA: pcm: Check PCM state at xfern compat ioctl

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commit f13876e2c3 upstream.

Since snd_pcm_ioctl_xfern_compat() has no PCM state check, it may go
further and hit the sanity check pcm_sanity_check() when the ioctl is
called right after open.  It may eventually spew a kernel warning, as
triggered by syzbot, depending on kconfig.

The lack of PCM state check there was just an oversight.  Although
it's no real crash, the spurious kernel warning is annoying, so let's
add the proper check.

Reported-by: syzbot+1dac3a4f6bc9c1c675d4@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Takashi Iwai 2018-05-02 08:48:46 +02:00 • committed by Greg Kroah-Hartman

parent 5f6e6d063a

commit e5e9a770ce

1 changed files with 2 additions and 0 deletions

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sound/core/pcm_compat.c

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