net: nfs: clean up bounds checks in nfs_readlink_reply()

Commit d6694018eadd ("net: nfs: fix buffer overflow in
nfs_readlink_reply()") added bounds checks against sizeof(nfs_path_buff)
before both memcpy() calls. This is a cosmetic cleanup of that fix:

- introduce a local new_len for the relative-path branch so the sum
  pathlen + rlen is computed once and reused for both the bounds check
  and the NUL terminator, rather than being open-coded twice;
- emit a diagnostic when a symlink target is rejected for exceeding the
  buffer, matching the style of other NFS error paths.

No functional change to the accept/reject decision.

This same overflow was independently discovered and privately reported
to the U-Boot maintainers on 2026-04-03, together with a working proof
of concept, ahead of the change that became the fix cited above. This
cleanup restores the local-variable form from that original report.

Signed-off-by: Murtaza Munaim <[email protected]>

0 files changed, 0 insertions, 0 deletions