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authorTakashi Iwai <tiwai@suse.de>2015-03-11 18:12:49 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-26 15:06:55 +0100
commit321f094062e1d3e9f8215078d565f3e3d019d042 (patch)
treeb13747039530eb822174f1eacdd367ebca2e3c10 /sound/core
parenteb3deba1b8edfcf985e6c30b082c502c75b894e7 (diff)
ALSA: control: Add sanity checks for user ctl id name string
commit be3bb8236db2d0fcd705062ae2e2a9d75131222f upstream. 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. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/core')
-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 98a29b26c5f4..f2082a35b890 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1168,6 +1168,10 @@ 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|