* [PATCH 1/1] ALSA: opl3: fix infoleak in opl3
@ 2020-07-06 3:27 Xidong Wang
2020-07-07 8:11 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: Xidong Wang @ 2020-07-06 3:27 UTC (permalink / raw)
To: Xidong Wang, Jaroslav Kysela, Takashi Iwai, alsa-devel, linux-kernel
From: xidongwang <wangxidong_97@163.com>
The stack object “info” in snd_opl3_ioctl() has a leaking problem.
It has 2 padding bytes which are not initialized and leaked via
“copy_to_user”.
Signed-off-by: xidongwang <wangxidong_97@163.com>
---
sound/drivers/opl3/opl3_synth.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/drivers/opl3/opl3_synth.c b/sound/drivers/opl3/opl3_synth.c
index e69a4ef..08c10ac 100644
--- a/sound/drivers/opl3/opl3_synth.c
+++ b/sound/drivers/opl3/opl3_synth.c
@@ -91,6 +91,8 @@ int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
{
struct snd_dm_fm_info info;
+ memset(&info, 0, sizeof(info));
+
info.fm_mode = opl3->fm_mode;
info.rhythm = opl3->rhythm;
if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
--
2.7.4
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2020-07-06 3:27 [PATCH 1/1] ALSA: opl3: fix infoleak in opl3 Xidong Wang
2020-07-07 8:11 ` Takashi Iwai
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