commit 0c34499805ecbeff45177727ae44418eb6c2dba5
author Vikas Katariya <Vikas.Katariya@arm.com> Thu Aug 15 14:24:20 2019 +0100
committer Vikas Katariya <Vikas.Katariya@arm.com> Wed Sep 04 11:19:38 2019 +0100
tree 5b12068e0a8c6c9eca746e00d57ac16325672a72
parent 376d0d9e4ac82a92c3f93d60c57912778479f7be

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 */