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Better handling of verify param id peername field

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Initialize pointers in param id by the book (explicit NULL assignment,
rather than just memset 0).

In x509_verify_param_zero() set peername to NULL after freeing it.

In x509_vfy.c's internal check_hosts(), avoid potential leak of
possibly already non-NULL peername.  This is only set when a check
succeeds, so don't need to do this repeatedly in the loop.

Reviewed-by: Richard Levitte <levitte@openssl.org>

(cherry picked from commit a0724ef1c9)
This commit is contained in:
Viktor Dukhovni
2015-09-01 21:47:12 -04:00
parent 0a1682d8b5
commit 39c76ceb2d
2 changed files with 15 additions and 4 deletions
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4
crypto/x509/x509_vfy.c
View File

@@ -753,6 +753,10 @@ static int check_hosts(X509 *x, X509_VERIFY_PARAM_ID *id)
int n = sk_OPENSSL_STRING_num(id->hosts);
char *name;
if (id->peername != NULL) {
OPENSSL_free(id->peername);
id->peername = NULL;
}
for (i = 0; i < n; ++i) {
name = sk_OPENSSL_STRING_value(id->hosts, i);
if (X509_check_host(x, name, 0, id->hostflags, &id->peername) > 0)

15
crypto/x509/x509_vpm.c
View File

@@ -155,6 +155,7 @@ static void x509_verify_param_zero(X509_VERIFY_PARAM *param)
}
if (paramid->peername)
OPENSSL_free(paramid->peername);
paramid->peername = NULL;
if (paramid->email) {
OPENSSL_free(paramid->email);
paramid->email = NULL;
@@ -165,7 +166,6 @@ static void x509_verify_param_zero(X509_VERIFY_PARAM *param)
paramid->ip = NULL;
paramid->iplen = 0;
}
}
X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
@@ -176,13 +176,20 @@ X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
param = OPENSSL_malloc(sizeof *param);
if (!param)
return NULL;
paramid = OPENSSL_malloc(sizeof *paramid);
memset(param, 0, sizeof(*param));
paramid = OPENSSL_malloc(sizeof(*paramid));
if (!paramid) {
OPENSSL_free(param);
return NULL;
}
memset(param, 0, sizeof *param);
memset(paramid, 0, sizeof *paramid);
memset(paramid, 0, sizeof(*paramid));
/* Exotic platforms may have non-zero bit representation of NULL */
paramid->hosts = NULL;
paramid->peername = NULL;
paramid->email = NULL;
paramid->ip = NULL;
param->id = paramid;
x509_verify_param_zero(param);
return param;