commit 52fa174a5a055e7b8e6ec7e2aa4df19986979064
author Vikas Katariya <Vikas.Katariya@arm.com> Thu Aug 15 11:59:08 2019 +0100
committer Vikas Katariya <Vikas.Katariya@arm.com> Wed Sep 04 11:31:35 2019 +0100
tree a304c2b1e4fe004de35b28771d1c133c30ba7427
parent 0ed1df6206b7c881d74670cac0eaed3c68edfe71

Check for zero length and NULL buffer pointer.

In reference to issue https://github.com/ARMmbed/mbed-crypto/issues/49

library/platform_util.c

diff --git a/library/platform_util.c b/library/platform_util.c
index 756e226..b1f7450 100644
--- a/library/platform_util.c
+++ b/library/platform_util.c
@@ -72,7 +72,10 @@
 
 void mbedtls_platform_zeroize( void *buf, size_t len )
 {
-    memset_func( buf, 0, len );
+    MBEDTLS_INTERNAL_VALIDATE( len == 0 || buf != NULL );
+
+    if( len > 0 )
+        memset_func( buf, 0, len );
 }
 #endif /* MBEDTLS_PLATFORM_ZEROIZE_ALT */