anchao opened a new pull request, #20856:
URL: https://github.com/apache/nuttx/pull/20856
## Summary
Fix the `recvfrom()` user buffer copyout size in kernel builds.
When `CONFIG_BUILD_KERNEL` is enabled, `recvfrom()` receives data into a
temporary kernel buffer before copying the result back to the user buffer.
The previous code copied the full requested length (`len`) regardless of
how many bytes were actually received.
For short receives, this could copy uninitialized bytes from the temporary
kernel buffer back to user space.
This change copies data back only when bytes were received, and limits the
copyout length to the actual return value from `psock_recvfrom()`.
It also avoids copying the source address back to user space when the
receive operation failed.
## Impact
- Prevents copying uninitialized kernel-buffer bytes on short receives.
- Avoids user address copyout on failed receives.
- Affects only `CONFIG_BUILD_KERNEL` builds.
- Non-kernel builds are unchanged.
## Testing
rv-virt/netnsh64
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