diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2022-10-10 08:59:02 +0300 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2022-10-11 17:08:26 +0300 |
| commit | bd86c69dae65de30f6d47249418ba7889809e31a (patch) | |
| tree | 8bc8039109fb10eb154db10f6280c481bbd843dd | |
| parent | 243a5263014a30436c93ed3f1f864c1da845455e (diff) | |
| download | linux-bd86c69dae65de30f6d47249418ba7889809e31a.tar.xz | |
NFSD: unregister shrinker when nfsd_init_net() fails
syzbot is reporting UAF read at register_shrinker_prepared() [1], for
commit 7746b32f467b3813 ("NFSD: add shrinker to reap courtesy clients on
low memory condition") missed that nfsd4_leases_net_shutdown() from
nfsd_exit_net() is called only when nfsd_init_net() succeeded.
If nfsd_init_net() fails due to nfsd_reply_cache_init() failure,
register_shrinker() from nfsd4_init_leases_net() has to be undone
before nfsd_init_net() returns.
Link: https://syzkaller.appspot.com/bug?extid=ff796f04613b4c84ad89 [1]
Reported-by: syzbot <syzbot+ff796f04613b4c84ad89@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 7746b32f467b3813 ("NFSD: add shrinker to reap courtesy clients on low memory condition")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | fs/nfsd/nfsctl.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 6a29bcfc9390..dc74a947a440 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1458,12 +1458,14 @@ static __net_init int nfsd_init_net(struct net *net) goto out_drc_error; retval = nfsd_reply_cache_init(nn); if (retval) - goto out_drc_error; + goto out_cache_error; get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); seqlock_init(&nn->writeverf_lock); return 0; +out_cache_error: + nfsd4_leases_net_shutdown(nn); out_drc_error: nfsd_idmap_shutdown(net); out_idmap_error: |