static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height)
{
    const uint8_t *frame_start = frame;
    const uint8_t *frame_end   = frame + width * height;
    int mask = 0x10000, bitbuf = 0;
    int i, v, offset, count, segments;

    segments = bytestream2_get_le16(gb);
    while (segments--) {
        if (bytestream2_get_bytes_left(gb) < 2)
            return AVERROR_INVALIDDATA;
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16u(gb);
            mask = 1;
        }

        if (bitbuf & mask) {
            v = bytestream2_get_le16(gb);
            offset = (v & 0x1FFF) << 2;
            count = ((v >> 13) + 2) << 1;
            if (frame - frame_start < offset || frame_end - frame < count*2 + width)
                return AVERROR_INVALIDDATA;
            for (i = 0; i < count; i++) {
                frame[0] = frame[1] =
                frame[width] = frame[width + 1] = frame[-offset];

                frame += 2;
            }
        } else if (bitbuf & (mask << 1)) {
            v = bytestream2_get_le16(gb)*2;
            if (frame - frame_end < v)
                 return AVERROR_INVALIDDATA;
             frame += v;
         } else {
            if (frame_end - frame < width + 3)
                 return AVERROR_INVALIDDATA;
             frame[0] = frame[1] =
             frame[width] = frame[width + 1] =  bytestream2_get_byte(gb);
            frame += 2;
            frame[0] = frame[1] =
            frame[width] = frame[width + 1] =  bytestream2_get_byte(gb);
            frame += 2;
        }
        mask <<= 2;
    }

    return 0;
}

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.