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nfsd4: fix crash on writing v4_end_grace before nfsd startup
[ Upstream commit62a063b8e7
] Anatoly Trosinenko reports that this: 1) Checkout fresh master Linux branch (tested with commite195ca6cb
) 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>
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@ -1103,6 +1103,8 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
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case 'Y':
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case 'y':
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case '1':
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if (nn->nfsd_serv)
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return -EBUSY;
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nfsd4_end_grace(nn);
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break;
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default:
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