1 files changed, 7 insertions, 0 deletions

diff --git a/src/lib/libcrypto/bn/bn_lib.c b/src/lib/libcrypto/bn/bn_lib.c
index b6b0ce4b3c..7767d65170 100644
--- a/src/lib/libcrypto/bn/bn_lib.c
+++ b/src/lib/libcrypto/bn/bn_lib.c
@@ -62,6 +62,7 @@
 #endif
 
 #include <assert.h>
+#include <limits.h>
 #include <stdio.h>
 #include "cryptlib.h"
 #include "bn_lcl.h"
@@ -319,6 +320,12 @@ BIGNUM *bn_expand2(BIGNUM *b, int words)
 
         if (words > b->dmax)
                 {
+                if (words > (INT_MAX/(4*BN_BITS2)))
+                        {
+                        BNerr(BN_F_BN_EXPAND2,BN_R_BIGNUM_TOO_LONG);
+                        return NULL;
+                        }
+                        
                 bn_check_top(b);        
                 if (BN_get_flags(b,BN_FLG_STATIC_DATA))
                         {