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Avoid wraparound on in_left

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Avoid wraparound on in_left
This commit is contained in:
mohammad1603 2018-03-19 07:15:50 -07:00
parent 2b1eea7202
commit 89c12ecfb5
1 changed files with 8 additions and 0 deletions
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8
library/ssl_tls.c
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@ -2402,6 +2402,14 @@ int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
if( ret < 0 ) if( ret < 0 )
return( ret ); return( ret );
// At this point ret value is positive, verify that adding ret
// value to ssl->in_left doesn't cause a wraparound
if (ssl->in_left + (size_t)ret < ssl->in_left)
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "wraparound happened over in_left value" ) );
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
ssl->in_left += ret; ssl->in_left += ret;
} }
} }