linux-ext4 - [PATCH] libext2fs: Only link an inode into a directory once

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Date:	Fri, 06 Jan 2012 20:47:43 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Theodore Tso <tytso@....edu>, "Darrick J. Wong" <djwong@...ibm.com>
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH] libext2fs: Only link an inode into a directory once

The ext2fs_link helper function link_proc does not check the value of ls->done,
which means that if the function finds multiple empty spaces that will fit the
new directory entry, it will create a directory entry in each of the spaces.
Instead of doing that, check the done value and don't do anything more if we've
already added the directory entry.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 lib/ext2fs/link.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/lib/ext2fs/link.c b/lib/ext2fs/link.c
index 2d03b57..2f4f54a 100644
--- a/lib/ext2fs/link.c
+++ b/lib/ext2fs/link.c
@@ -42,6 +42,9 @@ static int link_proc(struct ext2_dir_entry *dirent,
 	unsigned int rec_len, min_rec_len, curr_rec_len;
 	int ret = 0;

+	if (ls->done)
+		return 0;
+
 	rec_len = EXT2_DIR_REC_LEN(ls->namelen);

 	ls->err = ext2fs_get_rec_len(ls->fs, dirent, &curr_rec_len);

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