commit 027f84c69f4ef30c0693832a6c396ef19e563ca1
author Krzysztof Stachowiak <krzysiek.stachowiak@gmail.com> Tue Mar 13 11:29:24 2018 +0100
committer Krzysztof Stachowiak <krzysiek.stachowiak@gmail.com> Tue Mar 13 11:29:24 2018 +0100
tree d15d500b41496f405018f79eb993794cbd61b53c
parent a1098f81c252b317ad34ea978aea2bc47760b215

Prevent arithmetic overflow on bounds check

library/ssl_cli.c

diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 279a127..df6abc3 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -2489,7 +2489,7 @@
         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" ) );
             mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,