[PATCH 3/3] [CVE-2012-2375] [ONEIRIC] [NATTY] Fix length of buffer copied in __nfs4_get_acl_uncached

[Brad Figg]

From: Sachin Prabhu <sprabhu at redhat.com>

CVE-2012-2375

_copy_from_pages() used to copy data from the temporary buffer to the
user passed buffer is passed the wrong size parameter when copying
data. res.acl_len contains both the bitmap and acl lenghts while
acl_len contains the acl length after adjusting for the bitmap size.

Signed-off-by: Sachin Prabhu <sprabhu at redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust at netapp.com>
Signed-off-by: Brad Figg <brad.figg at canonical.com>
(cherry picked from commit 20e0fa98b751facf9a1101edaefbc19c82616a68)
---
 fs/nfs/nfs4proc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 2f8f3bb..ec8acdb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3609,7 +3609,7 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
 		if (acl_len > buflen)
 			goto out_free;
 		_copy_from_pages(buf, pages, res.acl_data_offset,
-				res.acl_len);
+				acl_len);
 	}
 	ret = acl_len;
 out_free:
-- 
1.7.9.5