tree b5d6f06a51123bc92f3d7f1e56153f8d8a8bb5de
parent 19f2215202d03f9cbd1d73f06f82f5c73c42704e
author FuzzTest Team <fuzztest@google.com> 1779784795 -0700
committer Copybara-Service <copybara-worker@google.com> 1779784815 -0700

Fix off-by-one error in Flatbuffers domain field mutation.

The random field selection in the Flatbuffers domain was using 0-based indexing with absl::Uniform, but the mutation logic was effectively 1-based. This change aligns the random selection to be 1-based by using absl::Uniform(prng, 1ul, field_count + 1) and adjusts the field iteration logic in MutateSelectedField to correctly handle the 1-based index. Also adds a check for field_count == 0 to prevent issues with absl::Uniform.

PiperOrigin-RevId: 921308530