From: Pavel Filipenský <pfilipensky@samba.org>
Date: Mon, 8 Dec 2025 15:09:53 +0000 (+0100)
Subject: nsswitch/libwbclient: Zero memory in libwbclient
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fremotes%2Fgitlab%2Fmaster;p=thirdparty%2Fsamba.git

nsswitch/libwbclient: Zero memory in libwbclient

Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>

Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Thu Jan  8 12:59:02 UTC 2026 on atb-devel-224
---

diff --git a/nsswitch/libwbclient/wbc_util.c b/nsswitch/libwbclient/wbc_util.c
index d97e00db383..59204b4deac 100644
--- a/nsswitch/libwbclient/wbc_util.c
+++ b/nsswitch/libwbclient/wbc_util.c
@@ -848,6 +848,11 @@ static void wbcNamedBlobDestructor(void *ptr)
 
 	while (b->name != NULL) {
 		free(discard_const_p(char, b->name));
+		/*
+		 * This targets sensitive data like "session_key". To make the
+		 * implementation simple, we zero every wbcNamedBlob.
+		 */
+		BURN_PTR_SIZE(b->blob.data, b->blob.length);
 		free(b->blob.data);
 		b += 1;
 	}