nfsd: Fix id-to-name cache entry leak in idtoname_parse()

idtoname_lookup() returns the id-to-name cache entry with a new
reference. The name is parsed between the lookup and the update call,
and when the parsed name is malformed (negative length or longer than
IDMAP_NAMESZ), idtoname_parse() jumps to the error label without
dropping the reference returned by idtoname_lookup(), leaking the cache
entry.

Release the reference with cache_put() before taking the error exit.

Fixes: f9ecc921b5b5 ("[PATCH] knfsd: Use new cache code for name/id lookup caches")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260917163154.2162438-1-vulab@iscas.ac.cn
Signed-off-by: Chuck Lever <cel@kernel.org>

0 files changed, 0 insertions, 0 deletions