The MurmurHash64A function in hyperloglog.c used an int parameter for length,
causing integer overflow when processing PFADD entries larger than 2GB.
This could lead to server crashes.

Changed the len parameter from int to size_t to properly handle
large inputs up to SIZE_MAX in HyperLogLog operations.
Refer to the implementation in facebook/mcrouter@2dbee3d/mcrouter/lib/fbi/hash.c#L54

…gument

When the HGETEX command is used with the FIELDS option but without the required
numfields argument, the server would attempt to access an out-of-bounds argv index.

This PR adds a check to ensure numfields is present before accessing it,
returning an error if it is missing. Also includes a test case to cover this scenario.

… (CVE-2025-62507)

This issue was introduced by #14130.
The problem is that when the number of IDs exceeds STREAMID_STATIC_VECTOR_LEN (8), the code forgot to reallocate memory for the IDs array, which causes a stack overflow.