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Prevent arithmetic overflow on bounds check

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Krzysztof Stachowiak 2018-03-13 11:29:24 +01:00
parent a1098f81c2
commit 027f84c69f
1 changed files with 1 additions and 1 deletions
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2
library/ssl_cli.c
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@ -2489,7 +2489,7 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
sig_len = ( p[0] << 8 ) | p[1]; sig_len = ( p[0] << 8 ) | p[1];
p += 2; p += 2;
if( end != p + sig_len ) if( p != end - sig_len )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,