commit c86b880411191c3e56105ea1bcd45314a73d77dc
author Krzysztof Stachowiak <krzysiek.stachowiak@gmail.com> Wed Mar 14 11:50:54 2018 +0100
committer Krzysztof Stachowiak <krzysiek.stachowiak@gmail.com> Wed Mar 14 14:39:01 2018 +0100
tree 564f7ff36590fa00f1331e54d13532ab451c67d2
parent ce0d3ca1282dc599a5c65038a8afc058238d605f

Prevent arithmetic overflow on bounds check

library/ssl_cli.c

diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index a126b79..b607fda 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -2246,7 +2246,7 @@
         sig_len = ( p[0] << 8 ) | p[1];
         p += 2;
 
-        if( end != p + sig_len )
+        if( p != end - sig_len )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
             return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );