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commit 82e68f7ffec3800425f2391c8c86277606860442
Author: Willy Tarreau <w@1wt.eu>
Date: Sat Aug 2 18:25:16 2008 +0200
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>
diff --git a/sound/core/seq/oss/seq_oss_synth.c b/sound/core/seq/oss/seq_oss_synth.c
index 558dadb..e024e45 100644
--- a/sound/core/seq/oss/seq_oss_synth.c
+++ b/sound/core/seq/oss/seq_oss_synth.c
@@ -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;
+ if (dev < 0 || dev >= dp->max_synthdev)
+ return -ENXIO;
+
if (dp->synths[dev].is_midi) {
struct midi_info minf;
snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf);
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