linux-ext4 - [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

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Message-Id: <200911081912.nA8JCaXW012400@demeter.kernel.org>
Date:	Sun, 8 Nov 2009 19:12:36 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

http://bugzilla.kernel.org/show_bug.cgi?id=14354





--- Comment #182 from Theodore Tso <tytso@....edu>  2009-11-08 19:12:34 ---
On Fri, Nov 06, 2009 at 10:07:15PM +0000, bugzilla-daemon@...zilla.kernel.org
wrote:
> For ext4, one thing I would suggest is to simply always put the NUL at the 
> end of the name, even if the filesystem might not need it. Then 
> nd_terminate_link() will still write the NUL, but it won't change any data 
> (and thus no CRC's).

It's pretty simple to do this; in fact it's a one-line change in
ext4_symlink() in fs/ext4/inode.c:

        /* clear the extent format for fast symlink */
        EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
        inode->i_op = &ext4_fast_symlink_inode_operations;
-        memcpy((char *)&EXT4_I(inode)->i_data, symname, l);
+        strcpy((char *)&EXT4_I(inode)->i_data, symname);
        inode->i_size = l-1;

                    - Ted

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