[PATCH 3.14 82/88] NFSD: Decrease nfsd_users in nfsd_startup_generic fail

Greg Kroah-Hartman
2014-09-03T23:23:58Z

From: Kinglong Mee <kinglongmee@gmail.com>

commit d9499a95716db0d4bc9b67e88fd162133e7d6b08 upstream.

A memory allocation failure could cause nfsd_startup_generic to fail, in
which case nfsd_users wouldn't be incorrectly left elevated.

After nfsd restarts nfsd_startup_generic will then succeed without doing
anything--the first consequence is likely nfs4_start_net finding a bad
laundry_wq and crashing.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Fixes: 4539f14981ce "nfsd: replace boolean nfsd_up flag by users counter"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfsd/nfssvc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -221,7 +221,8 @@ static int nfsd_startup_generic(int nrse
*/
ret = nfsd_racache_init(2*nrservs);
if (ret)
- return ret;
+ goto dec_users;
+
ret = nfs4_state_start();
if (ret)
goto out_racache;
@@ -229,6 +230,8 @@ static int nfsd_startup_generic(int nrse

out_racache:
nfsd_racache_shutdown();
+dec_users:
+ nfsd_users--;
return ret;
}