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

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>
master
Takashi Iwai 2021-01-15 10:34:28 +01:00
parent 67ea698c39
commit 217bfbb8b0
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;