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| author | Juergen Kreileder <jk@blackdown.de> | 2006-02-20 18:28:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-20 20:00:10 -0800 |
| commit | aa657ca9245a06fa435e00332a13da1fce182abc (patch) | |
| tree | 51e89251d12cd496cb502920467b8fa9a47b47b0 /sound | |
| parent | a9c930bac163c5e616ca0ba9378e7dc746c93227 (diff) | |
| download | linux-stable-aa657ca9245a06fa435e00332a13da1fce182abc.tar.gz linux-stable-aa657ca9245a06fa435e00332a13da1fce182abc.tar.bz2 linux-stable-aa657ca9245a06fa435e00332a13da1fce182abc.zip | |
[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')
| -rw-r--r-- | sound/core/control_compat.c | 16 |
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; } |