From: Pavel Filipenský <pfilipensky@samba.org>
Date: Wed, 27 Jul 2022 15:40:03 +0000 (+0200)
Subject: lib:util: Add BURN_FREE() and BURN_FREE_STR()
X-Git-Tag: talloc-2.4.0~1329
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fa29eed6810844dee1ca481a74ab80810baeda6b;p=thirdparty%2Fsamba.git

lib:util: Add BURN_FREE() and BURN_FREE_STR()

Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
---

diff --git a/lib/util/memory.h b/lib/util/memory.h
index 4f7986c9b0c..40c66d824a1 100644
--- a/lib/util/memory.h
+++ b/lib/util/memory.h
@@ -31,6 +31,33 @@
 #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
 #endif
 
+/**
+ * Zero string and free memory if the pointer and zero the pointer.
+ *
+ * @note You are explicitly allowed to pass NULL pointers -- they will
+ * always be ignored.
+ **/
+#define BURN_FREE_STR(x) do { \
+				if ((x) != NULL) { \
+					size_t s = strlen(x); \
+					memset_s((x), s, 0, s); \
+					free(x); (x) = NULL; \
+				} \
+			} while(0)
+
+/**
+ * Zero and free memory if the pointer and zero the pointer.
+ *
+ * @note You are explicitly allowed to pass NULL pointers -- they will
+ * always be ignored.
+ **/
+#define BURN_FREE(x, s) do { \
+				if ((x) != NULL) { \
+					memset_s((x), (s), 0, (s)); \
+					free(x); (x) = NULL; \
+				} \
+			} while(0)
+
 /**
  * Type-safe version of malloc. Allocated one copy of the
  * specified data type.