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author | J. Bruce Fields <bfields@redhat.com> | 2018-11-27 23:54:17 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-20 12:08:57 +0300 |
commit | 9fb787cb5f2d362c60adff66f883fc0b68a1e804 (patch) | |
tree | b8c85e494784e12185e089f5db7ae069b93076a7 /fs/nfsd | |
parent | 88331aa2d322acfff1148974de67de057e793d8c (diff) | |
download | linux-9fb787cb5f2d362c60adff66f883fc0b68a1e804.tar.xz |
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>
Diffstat (limited to 'fs/nfsd')
-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 ca73ca79a0ee..0e8574af298b 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1110,6 +1110,8 @@ 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: |