darwin: fix size calculation in select() fallback

Apple's `fd_set` stores its bits in an array of 32-bit integers, which
means `FD_ISSET()` may read out of bounds if we allocate storage at
byte granularity. There's also a chance that the `select()` call could
corrupt the heap, although I didn't investigate that.

This issue was discovered by LLVM's AddressSanitizer which caught
`FD_ISSET()` trying to read out of bounds.

PR-URL: https://github.com/libuv/libuv/pull/241
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

0 files changed, 0 insertions, 0 deletions