ALSA: isa/wavefront: prevent some out of bound writes

"header->number" can be up to USHRT_MAX and it comes from the ioctl so
it needs to be capped.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 69f76ff5693d4ec864a8dea68e374929bed66974..718d5e3b7806f01da8782ed9955c9d5dd22db57a 100644 (file)
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -785,6 +785,9 @@ wavefront_send_patch (snd_wavefront_t *dev, wavefront_patch_info *header)
        DPRINT (WF_DEBUG_LOAD_PATCH, "downloading patch %d\n",
                                      header->number);
 
+       if (header->number >= ARRAY_SIZE(dev->patch_status))
+               return -EINVAL;
+
        dev->patch_status[header->number] |= WF_SLOT_FILLED;
 
        bptr = buf;
@@ -809,6 +812,9 @@ wavefront_send_program (snd_wavefront_t *dev, wavefront_patch_info *header)
        DPRINT (WF_DEBUG_LOAD_PATCH, "downloading program %d\n",
                header->number);
 
+       if (header->number >= ARRAY_SIZE(dev->prog_status))
+               return -EINVAL;
+
        dev->prog_status[header->number] = WF_SLOT_USED;
 
        /* XXX need to zero existing SLOT_USED bit for program_status[i]
@@ -898,6 +904,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
                header->number = x;
        }
 
+       if (header->number >= WF_MAX_SAMPLE)
+               return -EINVAL;
+
        if (header->size) {
 
                /* XXX it's a debatable point whether or not RDONLY semantics