[copybara-service]

Copybara import of the project:

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1d17f75 by prasanna8585 65734642+prasanna8585@users.noreply.github.com:

Fix integer overflow in fully-connected-nc.c bias/kernel buffer sizing

output_channels * sizeof(xnn_float16) (xnn_create_fully_connected_nc_f16,
xnn_create_fully_connected_nc_pf16) and input_channels * output_channels *
sizeof(float) / output_channels * sizeof(float)
(xnn_create_fully_connected_nc_f32_f16, xnn_create_fully_connected_nc_pf32_f16)
were used directly as allocation sizes and write-loop bounds with no
overflow check, before any other parameter validation runs. On 32-bit
size_t targets this allows a caller-supplied channel count to wrap the
allocation size to a few bytes while the loop still writes/reads the real,
unwrapped count: heap-buffer-overflow write, plus an out-of-bounds read of
the caller-supplied bias array in the f16-bias case.

Guard all four sites with the existing xnn_safe_mul() helper, matching the
pattern already used for the main packed-weights buffer allocation
elsewhere in this file, returning xnn_status_invalid_parameter on overflow
instead of allocating an undersized buffer.

FUTURE_COPYBARA_INTEGRATE_REVIEW=#10935 from prasanna8585:fix/fully-connected-nc-output-channels-overflow fbb6b0d