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| author | J. Bruce Fields <bfields@redhat.com> | 2018-11-27 15:54:17 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-12 19:46:00 +0100 |
| commit | 51d0d8e65de67e6a2695aeae325f0af63041de4e (patch) | |
| tree | 1d7a18abdad9c0f165d72786323f017e014cba9e | |
| parent | 834dfbb83f85591ecca6992f0ef28710e209d017 (diff) | |
| download | linux-stable-51d0d8e65de67e6a2695aeae325f0af63041de4e.tar.gz linux-stable-51d0d8e65de67e6a2695aeae325f0af63041de4e.tar.bz2 linux-stable-51d0d8e65de67e6a2695aeae325f0af63041de4e.zip | |
nfsd4: fix crash on writing v4_end_grace before nfsd startup
[ Upstream commit 62a063b8e7d1db684db3f207261a466fa3194e72 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 6493df6b1bd5..4b8ebcc6b183 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: |