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ALSA: info: Drop WARN_ON() from buffer NULL sanity check 

commit 60379ba085 upstream.

snd_info_get_line() has a sanity check of NULL buffer -- both buffer
itself being NULL and buffer->buffer being NULL.  Basically both
checks are valid and necessary, but the problem is that it's with
snd_BUG_ON() macro that triggers WARN_ON().  The latter condition
(NULL buffer->buffer) can be met arbitrarily by user since the buffer
is allocated at the first write, so it means that user can trigger
WARN_ON() at will.

This patch addresses it by simply moving buffer->buffer NULL check out
of snd_BUG_ON() so that spurious WARNING is no longer triggered.

Reported-by: syzbot+e42d0746c3c3699b6061@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200717084023.5928-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Takashi Iwai 2020-07-17 10:40:23 +02:00 committed by Greg Kroah-Hartman
parent aad343d571
commit 0f87dabe44
1 changed files with 3 additions and 1 deletions
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4
sound/core/info.c
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@ -608,7 +608,9 @@ int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
{
int c = -1;
if (snd_BUG_ON(!buffer || !buffer->buffer))
if (snd_BUG_ON(!buffer))
return 1;
if (!buffer->buffer)
return 1;
if (len <= 0 || buffer->stop || buffer->error)
return 1;