Arcola / mbedtls

mbed TLS upgraded to 2.6.0

Fork of mbedtls by Mark Radbourne

Diff: library/ctr_drbg.c

Revision:
1:9ebc941037d5
Parent:
0:cdf462088d13
--- a/library/ctr_drbg.c	Thu Jan 05 00:18:44 2017 +0000
+++ b/library/ctr_drbg.c	Fri Sep 29 18:41:59 2017 +0100
@@ -290,7 +290,8 @@
     unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT];
     size_t seedlen = 0;
 
-    if( ctx->entropy_len + len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
+    if( ctx->entropy_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ||
+        len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - ctx->entropy_len )
         return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
 
     memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT );