oggparsedaala: check number of planes in pixel format map

This fixes crashes caused by out-of-bounds writes.

Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/libavformat/oggparsedaala.c b/libavformat/oggparsedaala.c
index dda8d70abd..24567f93a9 100644
--- a/libavformat/oggparsedaala.c
+++ b/libavformat/oggparsedaala.c
@@ -130,6 +130,12 @@ static int daala_header(AVFormatContext *s, int idx)
         hdr->fpr = bytestream2_get_byte(&gb);
 
         hdr->format.planes = bytestream2_get_byte(&gb);
+        if (hdr->format.planes > 4) {
+            av_log(s, AV_LOG_ERROR,
+                   "Invalid number of planes %d in daala pixel format map.\n",
+                   hdr->format.planes);
+            return AVERROR_INVALIDDATA;
+        }
         for (i = 0; i < hdr->format.planes; i++) {
             hdr->format.xdec[i] = bytestream2_get_byte(&gb);
             hdr->format.ydec[i] = bytestream2_get_byte(&gb);