static int dfa_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_frame,
                            AVPacket *avpkt)
{
    AVFrame *frame = data;
    DfaContext *s = avctx->priv_data;
    GetByteContext gb;
    const uint8_t *buf = avpkt->data;
    uint32_t chunk_type, chunk_size;
    uint8_t *dst;
    int ret;
    int i, pal_elems;
    int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0;

    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

    bytestream2_init(&gb, avpkt->data, avpkt->size);
    while (bytestream2_get_bytes_left(&gb) > 0) {
        bytestream2_skip(&gb, 4);
        chunk_size = bytestream2_get_le32(&gb);
        chunk_type = bytestream2_get_le32(&gb);
        if (!chunk_type)
            break;
        if (chunk_type == 1) {
            pal_elems = FFMIN(chunk_size / 3, 256);
            for (i = 0; i < pal_elems; i++) {
                s->pal[i] = bytestream2_get_be24(&gb) << 2;
                s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303;
            }
            frame->palette_has_changed = 1;
        } else if (chunk_type <= 9) {
            if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) {
                av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
                       chunk_name[chunk_type - 2]);
                return AVERROR_INVALIDDATA;
            }
        } else {
            av_log(avctx, AV_LOG_WARNING,
                   "Ignoring unknown chunk type %"PRIu32"\n",
                   chunk_type);
        }
        buf += chunk_size;
    }

    buf = s->frame_buf;
    dst = frame->data[0];
    for (i = 0; i < avctx->height; i++) {
        if(version == 0x100) {
            int j;
            for(j = 0; j < avctx->width; j++) {
                dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) +
                             ((j&3)*(avctx->height/4) + (i/4))*avctx->width];
            }
        } else {
            memcpy(dst, buf, avctx->width);
            buf += avctx->width;
        }
        dst += frame->linesize[0];
    }
    memcpy(frame->data[1], s->pal, sizeof(s->pal));

    *got_frame = 1;

    return avpkt->size;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.