mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 17:01:14 +00:00
41 lines
1013 B
Diff
41 lines
1013 B
Diff
|
From c1a22e59f87783d88dfbaeeb132b89be166b2754 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jeremy Allison <jra@samba.org>
|
||
|
|
Date: Wed, 20 Sep 2017 11:04:50 -0700
|
||
|
|
Subject: [PATCH 2/2] s3: smbd: Chain code can return uninitialized memory when
|
||
|
|
talloc buffer is grown.
|
||
|
|
|
||
|
|
Ensure we zero out unused grown area.
|
||
|
|
|
||
|
|
CVE-2017-15275
|
||
|
|
|
||
|
|
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13077
|
||
|
|
|
||
|
|
Signed-off-by: Jeremy Allison <jra@samba.org>
|
||
|
|
---
|
||
|
|
source3/smbd/srvstr.c | 14 ++++++++++++++
|
||
|
|
1 file changed, 14 insertions(+)
|
||
|
|
|
||
|
|
--- a/source3/smbd/srvstr.c
|
||
|
|
+++ b/source3/smbd/srvstr.c
|
||
|
|
@@ -70,6 +70,20 @@ ssize_t message_push_string(uint8 **outb
|
||
|
|
DEBUG(0, ("srvstr_push failed\n"));
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
+
|
||
|
|
+ /*
|
||
|
|
+ * Ensure we clear out the extra data we have
|
||
|
|
+ * grown the buffer by, but not written to.
|
||
|
|
+ */
|
||
|
|
+ if (buf_size + result < buf_size) {
|
||
|
|
+ return -1;
|
||
|
|
+ }
|
||
|
|
+ if (grow_size < result) {
|
||
|
|
+ return -1;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ memset(tmp + buf_size + result, '\0', grow_size - result);
|
||
|
|
+
|
||
|
|
set_message_bcc((char *)tmp, smb_buflen(tmp) + result);
|
||
|
|
|
||
|
|
*outbuf = tmp;
|