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| author | J. Bruce Fields <bfields@redhat.com> | 2018-11-27 15:54:17 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2018-11-28 18:36:02 -0500 |
| commit | 62a063b8e7d1db684db3f207261a466fa3194e72 (patch) | |
| tree | 643a3756a10752a30ee9f037375681c49b6c30b2 | |
| parent | b8db159239b3f51e2b909859935cc25cb3ff3eed (diff) | |
| download | linux-62a063b8e7d1db684db3f207261a466fa3194e72.tar.bz2 | |
nfsd4: fix crash on writing v4_end_grace before nfsd startup
Anatoly Trosinenko reports that this:
1) Checkout fresh master Linux branch (tested with commit e195ca6cb)
2) Copy x84_64-config-4.14 to .config, then enable NFS server v4 and build
3) From `kvm-xfstests shell`:
results in NULL dereference in locks_end_grace.
Check that nfsd has been started before trying to end the grace period.
Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| -rw-r--r-- | fs/nfsd/nfsctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 6384c9b94898..b33f9785b756 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1126,6 +1126,8 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) case 'Y': case 'y': case '1': + if (nn->nfsd_serv) + return -EBUSY; nfsd4_end_grace(nn); break; default: |