Commit b88eef28 authored by Nicolas Boichat's avatar Nicolas Boichat Committed by Luis Henriques

ALSA: seq: Fix snd_seq_call_port_info_ioctl in compat mode

commit 9586495d upstream.

This reverts one hunk of
commit ef44a1ec ("ALSA: sound/core: use memdup_user()"), which
replaced a number of kmalloc followed by memcpy with memdup calls.

In this case, we are copying from a struct snd_seq_port_info32 to a
struct snd_seq_port_info, but the latter is 4 bytes longer than the
32-bit version, so we need to separate kmalloc and copy calls.

Fixes: ef44a1ec ('ALSA: sound/core: use memdup_user()')
Signed-off-by: default avatarNicolas Boichat <drinkcat@chromium.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 1fe68765
...@@ -49,11 +49,12 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned ...@@ -49,11 +49,12 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned
struct snd_seq_port_info *data; struct snd_seq_port_info *data;
mm_segment_t fs; mm_segment_t fs;
data = memdup_user(data32, sizeof(*data32)); data = kmalloc(sizeof(*data), GFP_KERNEL);
if (IS_ERR(data)) if (!data)
return PTR_ERR(data); return -ENOMEM;
if (get_user(data->flags, &data32->flags) || if (copy_from_user(data, data32, sizeof(*data32)) ||
get_user(data->flags, &data32->flags) ||
get_user(data->time_queue, &data32->time_queue)) get_user(data->time_queue, &data32->time_queue))
goto error; goto error;
data->kernel = NULL; data->kernel = NULL;
......
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