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Date:   Fri, 22 Mar 2019 12:16:01 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Joseph Qi <>,
        Yihao Wu <>,
        "J. Bruce Fields" <>
Subject: [PATCH 4.4 223/230] nfsd: fix wrong check in write_v4_end_grace()

4.4-stable review patch.  If anyone has any objections, please let me know.


From: Yihao Wu <>

commit dd838821f0a29781b185cd8fb8e48d5c177bd838 upstream.

Commit 62a063b8e7d1 "nfsd4: fix crash on writing v4_end_grace before
nfsd startup" is trying to fix a NULL dereference issue, but it
mistakenly checks if the nfsd server is started. So fix it.

Fixes: 62a063b8e7d1 "nfsd4: fix crash on writing v4_end_grace before nfsd startup"
Reviewed-by: Joseph Qi <>
Signed-off-by: Yihao Wu <>
Signed-off-by: J. Bruce Fields <>
Signed-off-by: Greg Kroah-Hartman <>

 fs/nfsd/nfsctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1106,7 +1106,7 @@ static ssize_t write_v4_end_grace(struct
 		case 'Y':
 		case 'y':
 		case '1':
-			if (nn->nfsd_serv)
+			if (!nn->nfsd_serv)
 				return -EBUSY;

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