From: Vasily Averin <vvs@xxxxxxxxxxxxx>
This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 01b9b0b28626db4a47d7f48744d70abca9914ef1 ]
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@xxxxxxxxxxxxx>
Signed-off-by: Steve French <sfrench@localhost.localdomain>
CC: Stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/cifs/readdir.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index b1eede3..3634c7a 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -847,6 +847,7 @@ 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) {
--
2.5.0
--
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