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Subject[PATCH 3.2 52/87] cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
3.2.77-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Vasily Averin <vvs@virtuozzo.com>

commit 01b9b0b28626db4a47d7f48744d70abca9914ef1 upstream.

In some cases tmp_bug can be not filled in cifs_filldir and stay uninitialized,
therefore its printk with "%s" modifier can leak content of kernelspace memory.
If old content of this buffer does not contain '\0' access bejond end of
allocated object can crash the host.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Steve French <sfrench@localhost.localdomain>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/cifs/readdir.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -823,6 +823,7 @@ int cifs_readdir(struct file *file, void
}
/* if buggy server returns . and .. late do
we want to check for that here? */
+ *tmp_buf = 0;
rc = cifs_filldir(current_entry, file,
filldir, direntry, tmp_buf, max_len);
if (rc == -EOVERFLOW) {
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