From 4ab69a2b3b84415085d261bcf848b7a95c010c9d Mon Sep 17 00:00:00 2001 From: Adrian Knoth Date: Wed, 23 Feb 2011 11:43:14 +0100 Subject: [PATCH] ALSA: hdspm - prevent reading unitialized stack memory Original patch by Dan Rosenberg 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 Signed-off-by: Takashi Iwai --- sound/pci/rme9652/hdspm.c | 1 + 1 file changed, 1 insertion(+) 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); -- 2.30.2