From 2d4def005263614d23b9dcbf98f48c145ea1b0cf Mon Sep 17 00:00:00 2001 From: Pavel Kopyl Date: Tue, 7 Nov 2017 15:28:18 +0300 Subject: [PATCH] X509V3_EXT_add_nconf_sk, X509v3_add_ext: fix errors handling X509v3_add_ext: free 'sk' if the memory pointed to by it was malloc-ed inside this function. X509V3_EXT_add_nconf_sk: return an error if X509v3_add_ext() fails. This prevents use of a freed memory in do_body:sk_X509_EXTENSION_num(). Reviewed-by: Rich Salz Reviewed-by: Matt Caswell (Merged from https://github.com/openssl/openssl/pull/4698) --- crypto/x509/x509_v3.c | 3 ++- crypto/x509v3/v3_conf.c | 8 ++++++-- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/crypto/x509/x509_v3.c b/crypto/x509/x509_v3.c index 213e762f98..cbadd9be6f 100644 --- a/crypto/x509/x509_v3.c +++ b/crypto/x509/x509_v3.c @@ -128,7 +128,8 @@ STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x, X509err(X509_F_X509V3_ADD_EXT, ERR_R_MALLOC_FAILURE); err2: X509_EXTENSION_free(new_ex); - sk_X509_EXTENSION_free(sk); + if (x != NULL && *x == NULL) + sk_X509_EXTENSION_free(sk); return (NULL); } diff --git a/crypto/x509v3/v3_conf.c b/crypto/x509v3/v3_conf.c index f625ff542e..68ceab1dd3 100644 --- a/crypto/x509v3/v3_conf.c +++ b/crypto/x509v3/v3_conf.c @@ -313,8 +313,12 @@ int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section, return 0; if (ctx->flags == X509V3_CTX_REPLACE) delete_ext(*sk, ext); - if (sk) - X509v3_add_ext(sk, ext, -1); + if (sk != NULL) { + if (X509v3_add_ext(sk, ext, -1) == NULL) { + X509_EXTENSION_free(ext); + return 0; + } + } X509_EXTENSION_free(ext); } return 1; -- 2.25.1