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ALSA: sound/pci/rme9652: prevent reading uninitialized stack memory

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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 <[email protected]>
Cc: <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Dan Rosenberg 2010-09-25 11:07:27 -04:00 • committed by Takashi Iwai
commit e68d3b316a
2 changed files with 2 additions and 0 deletions
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1
sound/pci/rme9652/hdsp.c
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@ -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);

1
sound/pci/rme9652/hdspm.c
View file

@ -4127,6 +4127,7 @@ 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);