diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index 41e7b5939f..b931e40213 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -271,7 +271,7 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
 
     if (avctx->codec_tag == MKTAG('I','L','B','M')) { // interleaved
         if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {
-            for(y = 0; y < avctx->height; y++ ) {
+            for (y = 0; y < avctx->height && buf < buf_end; y++ ) {
                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
                 memset(row, 0, avctx->width);
                 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {