diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2010-09-25 11:07:27 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-28 21:04:14 -0700 |
| commit | 7b1178dc25f59d6f61dc87853d164e8ec87eba25 (patch) | |
| tree | 296c2bc083476e3d1e2962635fd9ff8d88c579ca | |
| parent | 207988da56b71bb6882f19c925b40e8349374e2e (diff) | |
ALSA: sound/pci/rme9652: prevent reading uninitialized stack memory
commit e68d3b316ab7b02a074edc4f770e6a746390cb7d upstream.
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | sound/pci/rme9652/hdsp.c | 1 | ||||
| -rw-r--r-- | sound/pci/rme9652/hdspm.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c index 4d6fbb36ab8a..cee643e19889 100644 --- a/sound/pci/rme9652/hdsp.c +++ b/sound/pci/rme9652/hdsp.c @@ -4569,6 +4569,7 @@ static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigne snd_printk(KERN_ERR "Hammerfall-DSP: Firmware needs to be uploaded to the card.\n"); return -EINVAL; } + 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); diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c index ab423bc82342..bd36bdd3d4c9 100644 --- a/sound/pci/rme9652/hdspm.c +++ b/sound/pci/rme9652/hdspm.c @@ -4133,6 +4133,7 @@ static int snd_hdspm_hwdep_ioctl(struct snd_hwdep * hw, struct file *file, case SNDRV_HDSPM_IOCTL_GET_CONFIG_INFO: + 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); |