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authorTakashi Iwai <tiwai@suse.de>2015-03-11 18:12:49 +0100
committerTakashi Iwai <tiwai@suse.de>2015-03-12 07:36:38 +0100
commitbe3bb8236db2d0fcd705062ae2e2a9d75131222f (patch)
tree844ead97a7f2fcb4dfcb59e078f19c7a22544dcb /sound
parentddb6ca75b5671b8fbf1909bc588c449ee74b34f9 (diff)
downloadlinux-linaro-stable-be3bb8236db2d0fcd705062ae2e2a9d75131222f.tar.gz
ALSA: control: Add sanity checks for user ctl id name string
There was no check about the id string of user control elements, so we accepted even a control element with an empty string, which is obviously bogus. This patch adds more sanity checks of id strings. Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/control.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 35324a8e83c8..eeb691d1911f 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1170,6 +1170,10 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
if (info->count < 1)
return -EINVAL;
+ if (!*info->id.name)
+ return -EINVAL;
+ if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name))
+ return -EINVAL;
access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
SNDRV_CTL_ELEM_ACCESS_INACTIVE|