From 2988a7740dc0dd9a0cb56576e8fe1d777dff0db3 Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Sat, 10 Feb 2007 01:46:16 -0800 Subject: [PATCH] [PATCH] return ENOENT from ext3_link when racing with unlink Return -ENOENT from ext[34]_link if we've raced with unlink and i_nlink is 0. Doing otherwise has the potential to corrupt the orphan inode list, because we'd wind up with an inode with a non-zero link count on the list, and it will never get properly cleaned up & removed from the orphan list before it is freed. [akpm@osdl.org: build fix] Signed-off-by: Eric Sandeen Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext3/namei.c | 6 ++++++ fs/ext4/namei.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c index 4df39c4315e1..57402b5f030c 100644 --- a/fs/ext3/namei.c +++ b/fs/ext3/namei.c @@ -2191,6 +2191,12 @@ static int ext3_link (struct dentry * old_dentry, if (inode->i_nlink >= EXT3_LINK_MAX) return -EMLINK; + /* + * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing + * otherwise has the potential to corrupt the orphan inode list. + */ + if (inode->i_nlink == 0) + return -ENOENT; retry: handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index e5a74a5ac261..05c0d7f8fdf9 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -2189,6 +2189,12 @@ static int ext4_link (struct dentry * old_dentry, if (inode->i_nlink >= EXT4_LINK_MAX) return -EMLINK; + /* + * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing + * otherwise has the potential to corrupt the orphan inode list. + */ + if (inode->i_nlink == 0) + return -ENOENT; retry: handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + -- 2.20.1