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Message-Id: <1454030348-17736-113-git-send-email-kamal@canonical.com>
Date: Thu, 28 Jan 2016 17:17:30 -0800
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Vasily Averin <vvs@...tuozzo.com>,
Steve French <sfrench@...alhost.localdomain>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 112/210] cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
3.19.8-ckt14 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Vasily Averin <vvs@...tuozzo.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@...tuozzo.com>
Signed-off-by: Steve French <sfrench@...alhost.localdomain>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
fs/cifs/readdir.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index c295338..c4be623 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -845,6 +845,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
* if buggy server returns . and .. late do we want to
* check for that here?
*/
+ *tmp_buf = 0;
rc = cifs_filldir(current_entry, file, ctx,
tmp_buf, max_len);
if (rc) {
--
1.9.1
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