linux-kernel - [PATCH review for 4.4 03/47] GFS2: Fix reference to ERR_PTR in gfs2_glock_iter

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Message-ID: <20170920044445.7392-3-alexander.levin@verizon.com>
Date:   Wed, 20 Sep 2017 04:45:00 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Bob Peterson <rpeterso@...hat.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH review for 4.4 03/47] GFS2: Fix reference to ERR_PTR in
 gfs2_glock_iter_next

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 14d37564fa3dc4e5d4c6828afcd26ac14e6796c5 ]

This patch fixes a place where function gfs2_glock_iter_next can
reference an invalid error pointer.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Bob Peterson <rpeterso@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 fs/gfs2/glock.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 070901e76653..1a20817ee1d7 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1798,16 +1798,18 @@ void gfs2_glock_exit(void)
 
 static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
 {
-	do {
-		gi->gl = rhashtable_walk_next(&gi->hti);
+	while ((gi->gl = rhashtable_walk_next(&gi->hti))) {
 		if (IS_ERR(gi->gl)) {
 			if (PTR_ERR(gi->gl) == -EAGAIN)
 				continue;
 			gi->gl = NULL;
+			return;
 		}
-	/* Skip entries for other sb and dead entries */
-	} while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) ||
-			      __lockref_is_dead(&gi->gl->gl_lockref)));
+		/* Skip entries for other sb and dead entries */
+		if (gi->sdp == gi->gl->gl_name.ln_sbd &&
+		    !__lockref_is_dead(&gi->gl->gl_lockref))
+			return;
+	}
 }
 
 static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
-- 
2.11.0