NetworkPkg/UefiPxeBcDxe: Add buffer check before reporting status code

When PxeBcLoadBootFile() fails, it reports a status code to notify
listeners (such as telemetry/SEL logging drivers) about the error.
However, the current implementation reports the status code for all
error conditions, including benign cases, such as where the caller passes
Buffer == NULL with EFI_BUFFER_TOO_SMALL to query the required size.

This causes false positive error reports in telemetry systems, as
EFI_BUFFER_TOO_SMALL with Buffer == NULL is an expected and normal
operation for size queries, not an actual error condition.

The PXE-E05 error message is already correctly guarded with the
condition "(Status == EFI_BUFFER_TOO_SMALL) && (Buffer != NULL)",
but the status code reporting was unconditional.

Add a buffer null check before REPORT_STATUS_CODE_WITH_EXTENDED_DATA
to ensure status codes are only reported for actual errors:
- Report when Status != EFI_BUFFER_TOO_SMALL (all other errors)
- Report when Status == EFI_BUFFER_TOO_SMALL AND Buffer != NULL (PXE-E05)
- Skip when Status == EFI_BUFFER_TOO_SMALL AND Buffer == NULL (size query)

This prevents spurious error logs while maintaining proper error
reporting for genuine failures including PXE-E05, PXE-E07, PXE-E09,
PXE-E99, and all other error conditions.

Signed-off-by: Marc Chen <marc.chen@microsoft.com>

0 files changed, 0 insertions, 0 deletions