diff --git a/libavcodec/cdxl.c b/libavcodec/cdxl.c
index 13ad57c8c1..0393839f36 100644
--- a/libavcodec/cdxl.c
+++ b/libavcodec/cdxl.c
@@ -80,7 +80,8 @@ static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
     GetBitContext gb;
     int x, y, plane;
 
-    init_get_bits(&gb, c->video, c->video_size * 8);
+    if (init_get_bits8(&gb, c->video, c->video_size) < 0)
+        return;
     for (plane = 0; plane < c->bpp; plane++) {
         for (y = 0; y < c->avctx->height; y++) {
             for (x = 0; x < c->avctx->width; x++)
@@ -95,7 +96,8 @@ static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
     GetBitContext  gb;
     int x, y, plane;
 
-    init_get_bits(&gb, c->video, c->video_size * 8);
+    if (init_get_bits8(&gb, c->video, c->video_size) < 0)
+        return;
     for (y = 0; y < c->avctx->height; y++) {
         for (plane = 0; plane < c->bpp; plane++) {
             for (x = 0; x < c->avctx->width; x++)