ALSA: rawmidi: Fix missing input substream checks in compat ioctls

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
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/rawmidi_compat.c b/sound/core/rawmidi_compat.c
index f69764d7cdd7025d3935143883c162372e3c0c7c..e30e30ba6e3984804ec325457d76d8195d69245d 100644 (file)
--- a/sound/core/rawmidi_compat.c
+++ b/sound/core/rawmidi_compat.c
@@ -36,8 +36,6 @@ static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
        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_compat(struct snd_rawmidi_file *rfile,
        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_compat(struct snd_rawmidi_file *rfile,
        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:
@@ -112,16 +116,18 @@ static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
        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: