[02/66] ALSA: sound/pci/rme9652: prevent reading uninitialized stack memory
diff mbox series

Message ID 20101022183556.427375646@clark.site
State New, archived
Headers show
  • review
Related show

Commit Message

Greg KH Oct. 22, 2010, 6:34 p.m. UTC
2.6.32-stable review patch.  If anyone has any objections, please let us know.


From: Dan Rosenberg <drosenberg@vsecurity.com>

commit e68d3b316ab7b02a074edc4f770e6a746390cb7d upstream.

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>

 sound/pci/rme9652/hdsp.c  |    1 +
 sound/pci/rme9652/hdspm.c |    1 +
 2 files changed, 2 insertions(+)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

diff mbox series

--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -4610,6 +4610,7 @@  static int snd_hdsp_hwdep_ioctl(struct s
 		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);
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -4127,6 +4127,7 @@  static int snd_hdspm_hwdep_ioctl(struct
+		memset(&info, 0, sizeof(info));
 		info.pref_sync_ref = hdspm_pref_sync_ref(hdspm);
 		info.wordclock_sync_check = hdspm_wc_sync_check(hdspm);