fix potential buffer read overflow for buffer with len < 8 Bytes

[paperino1983]

in function uint64_t hashmap_sip(const void *data, size_t len, uint64_t seed0,uint64_t seed1) wher the input buffer is smaller than 8 bytes, copy it into a zero-padded local buffer to avoid out-of-bounds reads

[tidwall]

The SIP64 function takes care of small (<8 bytes) buffers.

The function starts by looking for the end of the last known 8-byte segment.

    const uint8_t *end = in + inlen - (inlen % sizeof(uint64_t));
    for (; in != end; in += 8) {

[tidwall]

If the end equals in then that means the input is smaller than 8 bytes, and the function will only work on the single remaining bytes, one-by-one.

As far as I can tell it never reads past the end of the buffer.

[paperino1983]

If the end equals in then that means the input is smaller than 8 bytes, and the function will only work on the single remaining bytes, one-by-one.

As far as I can tell it never reads past the end of the buffer.

Hi Tidwall, my bad I think you're right ! Thanks for your prompt reveview

[tidwall]

No problem. :)