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Gmane
From: Greg KH <gregkh <at> suse.de>
Subject: [30/93] cifs: fix length calculation for converted unicode readdir names
Newsgroups: gmane.linux.kernel
Date: Friday 19th February 2010 16:29:23 UTC (over 6 years ago)
2.6.32-stable review patch.  If anyone has any objections, please let us
know.

------------------

From: Jeff Layton <[email protected]>

commit f12f98dba6ea1517cd7fbb912208893b9c014c15 upstream.

cifs_from_ucs2 returns the length of the converted name, including the
length of the NULL terminator. We don't want to include the NULL
terminator in the dentry name length however since that'll throw off the
hash calculation for the dentry cache.

I believe that this is the root cause of several problems that have
cropped up recently that seem to be papered over with the "noserverino"
mount option. More confirmation of that would be good, but this is
clearly a bug and it fixes at least one reproducible problem that
was reported.

This patch fixes at least this reproducer in this kernel.org bug:

    http://bugzilla.kernel.org/show_bug.cgi?id=15088#c12

Reported-by: Bjorn Tore Sund 
Acked-by: Dave Kleikamp 
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French 
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 fs/cifs/readdir.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -666,6 +666,7 @@ static int cifs_get_name_from_search_buf
 					   min(len, max_len), nlt,
 					   cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
+		pqst->len -= nls_nullsize(nlt);
 	} else {
 		pqst->name = filename;
 		pqst->len = len;
 
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