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ALSA: seq: oss: Fix missing error check in snd_seq_oss_synth_make_info() 

commit 217bfbb8b0 upstream.

snd_seq_oss_synth_make_info() didn't check the error code from
snd_seq_oss_midi_make_info(), and this leads to the call of strlcpy()
with the uninitialized string as the source, which may lead to the
access over the limit.

Add the proper error check for avoiding the failure.

Reported-by: syzbot+e42504ff21cff05a595f@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210115093428.15882-1-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 2021-01-15 10:34:28 +01:00 committed by Greg Kroah-Hartman
parent 9c301133be
commit 1607adf1ac
1 changed files with 2 additions and 1 deletions
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3
sound/core/seq/oss/seq_oss_synth.c
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@ -611,7 +611,8 @@ snd_seq_oss_synth_make_info(struct seq_oss_devinfo *dp, int dev, struct synth_in
if (info->is_midi) {
struct midi_info minf;
snd_seq_oss_midi_make_info(dp, info->midi_mapped, &minf);
if (snd_seq_oss_midi_make_info(dp, info->midi_mapped, &minf))
return -ENXIO;
inf->synth_type = SYNTH_TYPE_MIDI;
inf->synth_subtype = 0;
inf->nr_voices = 16;