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authorJuergen Kreileder <jk@blackdown.de>2006-02-21 05:28:00 +0300
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-21 07:00:10 +0300
commitaa657ca9245a06fa435e00332a13da1fce182abc (patch)
tree51e89251d12cd496cb502920467b8fa9a47b47b0 /sound/core/control_compat.c
parenta9c930bac163c5e616ca0ba9378e7dc746c93227 (diff)
downloadlinux-aa657ca9245a06fa435e00332a13da1fce182abc.tar.xz
[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: Juergen Kreileder <jk@blackdown.de> Cc: Jaroslav Kysela <perex@suse.cz> Acked-by: Takashi Iwai <tiwai@suse.de> Cc: Greg KH <greg@kroah.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'sound/core/control_compat.c')
-rw-r--r--sound/core/control_compat.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
index 418c6d4e5daf..a529b62972b4 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -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;
}