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authorAdrian Knoth <adi@drcomp.erfurt.thur.de>2011-02-23 11:43:14 +0100
committerTakashi Iwai <tiwai@suse.de>2011-02-23 15:46:29 +0100
commit4ab69a2b3b84415085d261bcf848b7a95c010c9d (patch)
treefb590d9c1a9158c686dd4eee1c7a728c4734f30b /sound/pci/rme9652/hdspm.c
parent7c4a95b5ec484244fc615be7b9f56c267c51ade6 (diff)
ALSA: hdspm - prevent reading unitialized stack memory
Original patch by Dan Rosenberg <drosenberg@vsecurity.com> under commit e68d3b316ab7b02a074edc4f770e6a746390cb7d. I'm copying his text here: The SNDRV_HDSPM_IOCTL_GET_CONFIG_INFO ioctl in hdspm.c allow unprivileged users to read uninitialized kernel stack memory, because several fields of the hdspm_config struct declared on the stack are not altered or zeroed before being copied back to the user. This patch takes care of it. Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/rme9652/hdspm.c')
-rw-r--r--sound/pci/rme9652/hdspm.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 0b0293fb8f09..ced1406d777f 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -6081,6 +6081,7 @@ static int snd_hdspm_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
case SNDRV_HDSPM_IOCTL_GET_CONFIG:
+ memset(&info, 0, sizeof(info));
spin_lock_irq(&hdspm->lock);
info.pref_sync_ref = hdspm_pref_sync_ref(hdspm);
info.wordclock_sync_check = hdspm_wc_sync_check(hdspm);