From c7d106c90ec40a0e35a6960157b40f238627246e Mon Sep 17 00:00:00 2001 From: Neil Brown Date: Thu, 12 Jun 2008 13:38:42 +1000 Subject: [PATCH] nfsd: fix race in nfsd_nrthreads() We need the nfsd_mutex before accessing nfsd_serv->sv_nrthreads or we can't even guarantee nfsd_serv will still be there. Signed-off-by: Neil Brown Acked-by: Jeff Layton Signed-off-by: J. Bruce Fields --- fs/nfsd/nfssvc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 26c81149d49a..96fdbcab8d95 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -165,10 +165,12 @@ int nfsd_vers(int vers, enum vers_op change) int nfsd_nrthreads(void) { - if (nfsd_serv == NULL) - return 0; - else - return nfsd_serv->sv_nrthreads; + int rv = 0; + mutex_lock(&nfsd_mutex); + if (nfsd_serv) + rv = nfsd_serv->sv_nrthreads; + mutex_unlock(&nfsd_mutex); + return rv; } static void nfsd_last_thread(struct svc_serv *serv) -- GitLab