ALSA: hda-intel: Avoid divide by zero crash

On my AMD780V chipset, hda_intel.c can crash the kernel with a divide by
zero
for as-yet unknown reasons. A simple check for zero prevents it, though
the problem that causes it remains. Since the workaround is harmless and
won't affect anyone except victims of this bug, it should be safe;
moreover,
because this crash can be triggered by a user-mode application, there are
denial of service implications on the systems affected by the bug without
the patch.

Signed-off-by: Jody Bruchon <jody@nctritech.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index b8faa6dc5abef5ba38d1d1bd1047d645cc203d69..e767c3f395ab87dceae4cb3eae698a05e89d10b5 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1893,6 +1893,12 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
 
        if (!bdl_pos_adj[chip->dev_index])
                return 1; /* no delayed ack */
+       if (azx_dev->period_bytes == 0) {
+               printk(KERN_WARNING
+                      "hda-intel: Divide by zero was avoided "
+                      "in azx_dev->period_bytes.\n");
+               return 0;
+       }
        if (pos % azx_dev->period_bytes > azx_dev->period_bytes / 2)
                return 0; /* NG - it's below the period boundary */
        return 1; /* OK, it's fine */