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sound: ensure device number is valid in snd_seq_oss_synth_make_info 

snd_seq_oss_synth_make_info() incorrectly reports information
to userspace without first checking for the validity of the
device number, leading to possible information leak (CVE-2008-3272).

Reported-By: Tobias Klein <tk@trapkit.de>
Acked-and-tested-by: Takashi Iwai <tiwai@suse.de>
Cc: stable@kernel.org
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Willy Tarreau 2008-08-02 18:25:16 +02:00 committed by Linus Torvalds
parent 82248a5e92
commit 82e68f7ffe
1 changed files with 3 additions and 0 deletions
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3
sound/core/seq/oss/seq_oss_synth.c
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@ -604,6 +604,9 @@ snd_seq_oss_synth_make_info(struct seq_oss_devinfo *dp, int dev, struct synth_in
{ {
struct seq_oss_synth *rec; struct seq_oss_synth *rec;
if (dev < 0 || dev >= dp->max_synthdev)
return -ENXIO;
if (dp->synths[dev].is_midi) { if (dp->synths[dev].is_midi) {
struct midi_info minf; struct midi_info minf;
snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf); snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf);