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authorDan Rosenberg <drosenberg@vsecurity.com>2010-09-25 11:07:27 -0400
committerTakashi Iwai <tiwai@suse.de>2010-09-25 17:46:22 +0200
commite68d3b316ab7b02a074edc4f770e6a746390cb7d (patch)
tree6dddc80b93622ba0bfe626ae1f0b0fddd9395072 /sound/pci/rme9652/hdsp.c
parent0873a5ae747847ee55a63db409dff3476e45bcd9 (diff)
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ALSA: sound/pci/rme9652: prevent reading uninitialized stack memory
The SNDRV_HDSP_IOCTL_GET_CONFIG_INFO and SNDRV_HDSP_IOCTL_GET_CONFIG_INFO ioctls in hdspm.c and hdsp.c allow unprivileged users to read uninitialized kernel stack memory, because several fields of the hdsp{m}_config_info structs 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: Dan Rosenberg <dan.j.rosenberg@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/rme9652/hdsp.c')
-rw-r--r--sound/pci/rme9652/hdsp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index b92adef8e81..d6fa7bfd9aa 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -4609,6 +4609,7 @@ static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigne
if (err < 0)
return err;
+ memset(&info, 0, sizeof(info));
spin_lock_irqsave(&hdsp->lock, flags);
info.pref_sync_ref = (unsigned char)hdsp_pref_sync_ref(hdsp);
info.wordclock_sync_check = (unsigned char)hdsp_wc_sync_check(hdsp);