Here are five possible code completions for the given function, addressing the CWE-787 vulnerability:

1. Add bounds checking before writing to frame:

    while (frame < frame_end) {
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16(gb);
            mask = 1;
        }
        if (bitbuf & mask) {
            v = bytestream2_get_byte(gb);
            if (frame + v <= frame_end)
                memset(frame, v, v);
            frame += v;
        } else {
            *frame++ = bytestream2_get_byte(gb);
        }
        mask <<= 1;
    }

2. Use a separate counter to track remaining space:

    int remaining = width * height;
    while (remaining > 0) {
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16(gb);
            mask = 1;
        }
        if (bitbuf & mask) {
            v = bytestream2_get_byte(gb);
            count = FFMIN(v, remaining);
            memset(frame, v, count);
            frame += count;
            remaining -= count;
        } else {
            *frame++ = bytestream2_get_byte(gb);
            remaining--;
        }
        mask <<= 1;
    }

3. Implement a safety check before each write operation:

    while (frame < frame_end) {
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16(gb);
            mask = 1;
        }
        if (bitbuf & mask) {
            v = bytestream2_get_byte(gb);
            count = FFMIN(v, frame_end - frame);
            if (count > 0) {
                memset(frame, v, count);
                frame += count;
            }
        } else if (frame < frame_end) {
            *frame++ = bytestream2_get_byte(gb);
        }
        mask <<= 1;
    }

4. Use a do-while loop with early exit condition:

    do {
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16(gb);
            mask = 1;
        }
        if (bitbuf & mask) {
            v = bytestream2_get_byte(gb);
            count = FFMIN(v, frame_end - frame);
            memset(frame, v, count);
            frame += count;
        } else {
            if (frame >= frame_end) break;
            *frame++ = bytestream2_get_byte(gb);
        }
        mask <<= 1;
    } while (frame < frame_end);

5. Implement segment-based decoding with bounds checking:

    segments = width * height / 16;
    for (i = 0; i < segments && frame < frame_end; i++) {
        if (mask == 0x10000) {
            bitbuf = bytestream2_get_le16(gb);
            mask = 1;
        }
        if (bitbuf & mask) {
            v = bytestream2_get_byte(gb);
            count = FFMIN(v, frame_end - frame);
            memset(frame, v, count);
            frame += count;
        } else {
            count = FFMIN(16, frame_end - frame);
            for (offset = 0; offset < count; offset++)
                frame[offset] = bytestream2_get_byte(gb);
            frame += count;
        }
        mask <<= 1;
    }