linux-ext4 - [PATCH] ext4: use IS_ERR() for error checking of path

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Date:   Tue, 27 Oct 2020 13:43:42 -0700
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] ext4: use IS_ERR() for error checking of path

With this fix, fast commit recovery code uses IS_ERR() for path
returned by ext4_find_extent.

Fixes: 8016e29f4362 ("ext4: fast commit recovery path")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
 fs/ext4/fast_commit.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 3ee43fd6d5aa..8d43058386c3 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -1616,8 +1616,10 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
 		if (ret == 0) {
 			/* Range is not mapped */
 			path = ext4_find_extent(inode, cur, NULL, 0);
-			if (!path)
-				continue;
+			if (IS_ERR(path)) {
+				iput(inode);
+				return 0;
+			}
 			memset(&newex, 0, sizeof(newex));
 			newex.ee_block = cpu_to_le32(cur);
 			ext4_ext_store_pblock(
-- 
2.29.0.rc2.309.g374f81d7ae-goog