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Avoid NULL dereference in ieee802_1x_get_mib_sta() printf

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In function ieee802_1x_get_mib_sta(), eap_server_get_name() may return
NULL, and it could be dereferenced immidiately by os_snprintf() (if the
snprintf implementation does not handle NULL pointer).

Signed-hostap: Eytan Lifshitz <eytan.lifshitz@intel.com>
This commit is contained in:
Eytan Lifshitz 2014-02-10 12:55:09 +02:00 committed by Jouni Malinen
parent 97efe70b60
commit 6ceb95c950
1 changed files with 6 additions and 2 deletions
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8
src/ap/ieee802_1x.c
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@ -1953,6 +1953,8 @@ int ieee802_1x_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
int len = 0, ret;
struct eapol_state_machine *sm = sta->eapol_sm;
struct os_reltime diff;
const char *name1;
const char *name2;
if (sm == NULL)
return 0;
@ -2088,13 +2090,15 @@ int ieee802_1x_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
return len;
len += ret;
name1 = eap_server_get_name(0, sm->eap_type_authsrv);
name2 = eap_server_get_name(0, sm->eap_type_supp);
ret = os_snprintf(buf + len, buflen - len,
"last_eap_type_as=%d (%s)\n"
"last_eap_type_sta=%d (%s)\n",
sm->eap_type_authsrv,
eap_server_get_name(0, sm->eap_type_authsrv),
name1 ? name1 : "",
sm->eap_type_supp,
eap_server_get_name(0, sm->eap_type_supp));
name2 ? name2 : "");
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;