From 3bed13df1ce2466edc0b441427c122265deed509 Mon Sep 17 00:00:00 2001 From: Janos Follath Date: Tue, 9 Feb 2016 14:51:35 +0000 Subject: [PATCH] Included test for integer underflow. --- library/rsa.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/library/rsa.c b/library/rsa.c index fd33b53f0..154fa58c9 100644 --- a/library/rsa.c +++ b/library/rsa.c @@ -717,8 +717,12 @@ int rsa_rsaes_oaep_decrypt( rsa_context *ctx, */ hlen = md_get_size( md_info ); - md_init( &md_ctx ); - md_init_ctx( &md_ctx, md_info ); + // checking for integer underflow + if( 2 * hlen + 2 > ilen ) + return( POLARSSL_ERR_RSA_BAD_INPUT_DATA ); + + mbedtls_md_init( &md_ctx ); + mbedtls_md_setup( &md_ctx, md_info, 0 ); /* Generate lHash */ md( md_info, label, label_len, lhash );