diff options
| author | Jeff Layton <jlayton@kernel.org> | 2024-06-17 07:54:08 -0400 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2024-06-17 10:13:59 -0400 |
| commit | 8e948c365d9c10b685d1deb946bd833d6a9b43e0 (patch) | |
| tree | e546dd6976ad09b5d738bc5a2e52aede76f6cb4c | |
| parent | 4a77c3dead97339478c7422eb07bf4bf63577008 (diff) | |
nfsd: fix oops when reading pool_stats before server is started
Sourbh reported an oops that is triggerable by trying to read the
pool_stats procfile before nfsd had been started. Move the check for a
NULL serv in svc_pool_stats_start above the mutex acquisition, and fix
the stop routine not to unlock the mutex if there is no serv yet.
Fixes: 7b207ccd9833 ("svc: don't hold reference for poolstats, only mutex.")
Reported-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | net/sunrpc/svc_xprt.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index dd86d7f1e97e..49a3bea33f9d 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -1421,12 +1421,13 @@ static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); + if (!si->serv) + return NULL; + mutex_lock(si->mutex); if (!pidx) return SEQ_START_TOKEN; - if (!si->serv) - return NULL; return pidx > si->serv->sv_nrpools ? NULL : &si->serv->sv_pools[pidx - 1]; } @@ -1458,7 +1459,8 @@ static void svc_pool_stats_stop(struct seq_file *m, void *p) { struct svc_info *si = m->private; - mutex_unlock(si->mutex); + if (si->serv) + mutex_unlock(si->mutex); } static int svc_pool_stats_show(struct seq_file *m, void *p) |