linux-kernel - [PATCH 5.10 590/717] ext4: fix an IS

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Message-Id: <20201228125049.178226312@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:49:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
        stable@...nel.org
Subject: [PATCH 5.10 590/717] ext4: fix an IS_ERR() vs NULL check

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

commit bc18546bf68e47996a359d2533168d5770a22024 upstream.

The ext4_find_extent() function never returns NULL, it returns error
pointers.

Fixes: 44059e503b03 ("ext4: fast commit recovery path")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Link: https://lore.kernel.org/r/20201023112232.GB282278@mwanda
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/extents.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5815,8 +5815,8 @@ int ext4_ext_replay_update_ex(struct ino
 	int ret;
 
 	path = ext4_find_extent(inode, start, NULL, 0);
-	if (!path)
-		return -EINVAL;
+	if (IS_ERR(path))
+		return PTR_ERR(path);
 	ex = path[path->p_depth].p_ext;
 	if (!ex) {
 		ret = -EFSCORRUPTED;