1 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/libcrypto/mem.c b/src/lib/libcrypto/mem.c
index 3b5b2bbc68..c0dc37c4bd 100644
--- a/src/lib/libcrypto/mem.c
+++ b/src/lib/libcrypto/mem.c
@@ -174,6 +174,8 @@ void *CRYPTO_malloc_locked(int num, const char *file, int line)
         {
         void *ret = NULL;
 
+        if (num < 0) return NULL;
+
         allow_customize = 0;
         if (malloc_debug_func != NULL)
                 {
@@ -206,6 +208,8 @@ void *CRYPTO_malloc(int num, const char *file, int line)
         {
         void *ret = NULL;
 
+        if (num < 0) return NULL;
+
         allow_customize = 0;
         if (malloc_debug_func != NULL)
                 {
@@ -226,6 +230,8 @@ void *CRYPTO_realloc(void *str, int num, const char *file, int line)
         {
         void *ret = NULL;
 
+        if (num < 0) return NULL;
+
         if (realloc_debug_func != NULL)
                 realloc_debug_func(str, NULL, num, file, line, 0);
         ret = realloc_func(str,num);