[PATCH 3.16 177/366] ALSA: rawmidi: Fix missing input substream checks in compat ioctls

Ben Hutchings
2018-10-14T23:31:16Z

From: Takashi Iwai <tiwai@suse.de>

commit 8a56ef4f3ffba9ebf4967b61ef600b0a7ba10f11 upstream.

Some rawmidi compat ioctls lack of the input substream checks
(although they do check only for rfile->output). This many eventually
lead to an Oops as NULL substream is passed to the rawmidi core
functions.

Fix it by adding the proper checks before each function call.

The bug was spotted by syzkaller.

Reported-by: syzbot+f7a0348affc3b67bc617@syzkaller.appspotmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
sound/core/rawmidi_compat.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)

--- a/sound/core/rawmidi_compat.c
+++ b/sound/core/rawmidi_compat.c
@@ -36,8 +36,6 @@ static int snd_rawmidi_ioctl_params_comp
struct snd_rawmidi_params params;
unsigned int val;

- if (rfile->output == NULL)
- return -EINVAL;
if (get_user(params.stream, &src->stream) ||
get_user(params.buffer_size, &src->buffer_size) ||
get_user(params.avail_min, &src->avail_min) ||
@@ -46,8 +44,12 @@ static int snd_rawmidi_ioctl_params_comp
params.no_active_sensing = val;
switch (params.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
+ if (!rfile->output)
+ return -EINVAL;
return snd_rawmidi_output_params(rfile->output, &params);
case SNDRV_RAWMIDI_STREAM_INPUT:
+ if (!rfile->input)
+ return -EINVAL;
return snd_rawmidi_input_params(rfile->input, &params);
}
return -EINVAL;
@@ -67,16 +69,18 @@ static int snd_rawmidi_ioctl_status_comp
int err;
struct snd_rawmidi_status status;

- if (rfile->output == NULL)
- return -EINVAL;
if (get_user(status.stream, &src->stream))
return -EFAULT;

switch (status.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
+ if (!rfile->output)
+ return -EINVAL;
err = snd_rawmidi_output_status(rfile->output, &status);
break;
case SNDRV_RAWMIDI_STREAM_INPUT:
+ if (!rfile->input)
+ return -EINVAL;
err = snd_rawmidi_input_status(rfile->input, &status);
break;
default:
@@ -113,16 +117,18 @@ static int snd_rawmidi_ioctl_status_x32(
int err;
struct snd_rawmidi_status status;

- if (rfile->output == NULL)
- return -EINVAL;
if (get_user(status.stream, &src->stream))
return -EFAULT;

switch (status.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
+ if (!rfile->output)
+ return -EINVAL;
err = snd_rawmidi_output_status(rfile->output, &status);
break;
case SNDRV_RAWMIDI_STREAM_INPUT:
+ if (!rfile->input)
+ return -EINVAL;
err = snd_rawmidi_input_status(rfile->input, &status);
break;