Commit aa657ca9 authored by Juergen Kreileder's avatar Juergen Kreileder Committed by Linus Torvalds

[PATCH] Fix snd-usb-audio in 32-bit compat environment

I'm getting oopses with snd-usb-audio in 32-bit compat environments:
control_compat.c:get_ctl_type() doesn't initialize 'info', so
'itemlist[uinfo->value.enumerated.item]' in
usbmixer.c:mixer_ctl_selector_info() might access random memory (The 'if
((int)uinfo->value.enumerated.item >= cval->max)' doesn't fix all problems
because of the unsigned -> signed conversion.)
Signed-off-by: default avatarJuergen Kreileder <jk@blackdown.de>
Cc: Jaroslav Kysela <perex@suse.cz>
Acked-by: default avatarTakashi Iwai <tiwai@suse.de>
Cc: Greg KH <greg@kroah.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a9c930ba
......@@ -167,7 +167,7 @@ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
int *countp)
{
struct snd_kcontrol *kctl;
struct snd_ctl_elem_info info;
struct snd_ctl_elem_info *info;
int err;
down_read(&card->controls_rwsem);
......@@ -176,13 +176,19 @@ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
up_read(&card->controls_rwsem);
return -ENXIO;
}
info.id = *id;
err = kctl->info(kctl, &info);
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL) {
up_read(&card->controls_rwsem);
return -ENOMEM;
}
info->id = *id;
err = kctl->info(kctl, info);
up_read(&card->controls_rwsem);
if (err >= 0) {
err = info.type;
*countp = info.count;
err = info->type;
*countp = info->count;
}
kfree(info);
return err;
}
......
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