linux-kernel - [PATCH -next] ext4: fix miss release buffer head in ext4_fc_write

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Date:   Wed, 14 Sep 2022 18:08:59 +0800
From:   Ye Bin <yebin10@...wei.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>,
        <linux-ext4@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <jack@...e.cz>,
        Ye Bin <yebin10@...wei.com>
Subject: [PATCH -next] ext4: fix miss release buffer head in ext4_fc_write_inode

In 'ext4_fc_write_inode' function first call 'ext4_get_inode_loc' get 'iloc',
after use it miss release 'iloc.bh'.
So just release 'iloc.bh' before 'ext4_fc_write_inode' return.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 fs/ext4/fast_commit.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 2af962cbb835..b7414a5812f6 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -874,22 +874,25 @@ static int ext4_fc_write_inode(struct inode *inode, u32 *crc)
 	tl.fc_tag = cpu_to_le16(EXT4_FC_TAG_INODE);
 	tl.fc_len = cpu_to_le16(inode_len + sizeof(fc_inode.fc_ino));
 
+	ret = -ECANCELED;
 	dst = ext4_fc_reserve_space(inode->i_sb,
 			sizeof(tl) + inode_len + sizeof(fc_inode.fc_ino), crc);
 	if (!dst)
-		return -ECANCELED;
+		goto err;
 
 	if (!ext4_fc_memcpy(inode->i_sb, dst, &tl, sizeof(tl), crc))
-		return -ECANCELED;
+		goto err;
 	dst += sizeof(tl);
 	if (!ext4_fc_memcpy(inode->i_sb, dst, &fc_inode, sizeof(fc_inode), crc))
-		return -ECANCELED;
+		goto err;
 	dst += sizeof(fc_inode);
 	if (!ext4_fc_memcpy(inode->i_sb, dst, (u8 *)ext4_raw_inode(&iloc),
 					inode_len, crc))
-		return -ECANCELED;
-
-	return 0;
+		goto err;
+	ret = 0;
+err:
+	brelse(iloc.bh);
+	return ret;
 }
 
 /*
-- 
2.31.1