| From | Jiri Slaby <> | Subject | [PATCH 3.12 112/142] cifs_dbg() outputs an uninitialized buffer in cifs_readdir() | Date | Wed, 24 Feb 2016 11:05:07 +0100 |
| |
From: Vasily Averin <vvs@virtuozzo.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
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 <steve.french@primarydata.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- fs/cifs/readdir.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c index e327a9207ee1..5454aff19d18 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -849,6 +849,7 @@ 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) { -- 2.7.1
|