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RADIUS client: Fix crash issue in radius_client_timer()

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While iterating through RADIUS messages in radius_client_timer(), one
message entry may get flushed by "radius_client_retransmit -->
radius_client_handle_send_error --> radius_client_init_auth -->
radius_change_server --> radius_client_flush". This could result in
freed memory being accessed afterwards.

Signed-off-by: Jerry Yang <xyang@sonicwall.com>
This commit is contained in:
Jerry Yang 2014-05-29 14:32:33 +08:00 committed by Jouni Malinen
parent c1fb75a6e2
commit d045cc8e4c
1 changed files with 29 additions and 6 deletions
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35
src/radius/radius_client.c
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@ -295,8 +295,12 @@ int radius_client_register(struct radius_client_data *radius,
}
static void radius_client_handle_send_error(struct radius_client_data *radius,
int s, RadiusType msg_type)
/*
* Returns >0 if message queue was flushed (i.e., the message that triggered
* the error is not available anymore)
*/
static int radius_client_handle_send_error(struct radius_client_data *radius,
int s, RadiusType msg_type)
{
#ifndef CONFIG_NATIVE_WINDOWS
int _errno = errno;
@ -309,12 +313,18 @@ static void radius_client_handle_send_error(struct radius_client_data *radius,
" try to connect again");
eloop_unregister_read_sock(s);
close(s);
if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM)
if (msg_type == RADIUS_ACCT ||
msg_type == RADIUS_ACCT_INTERIM) {
radius_client_init_acct(radius);
else
return 0;
} else {
radius_client_init_auth(radius);
return 1;
}
}
#endif /* CONFIG_NATIVE_WINDOWS */
return 0;
}
@ -353,8 +363,11 @@ static int radius_client_retransmit(struct radius_client_data *radius,
os_get_reltime(&entry->last_attempt);
buf = radius_msg_get_buf(entry->msg);
if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
radius_client_handle_send_error(radius, s, entry->msg_type);
if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
if (radius_client_handle_send_error(radius, s, entry->msg_type)
> 0)
return 0;
}
entry->next_try = now + entry->next_wait;
entry->next_wait *= 2;
@ -378,6 +391,7 @@ static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
struct radius_msg_list *entry, *prev, *tmp;
int auth_failover = 0, acct_failover = 0;
char abuf[50];
size_t prev_num_msgs;
entry = radius->msgs;
if (!entry)
@ -388,6 +402,7 @@ static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
prev = NULL;
while (entry) {
prev_num_msgs = radius->num_msgs;
if (now.sec >= entry->next_try &&
radius_client_retransmit(radius, entry, now.sec)) {
if (prev)
@ -402,6 +417,14 @@ static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
continue;
}
if (prev_num_msgs != radius->num_msgs) {
wpa_printf(MSG_DEBUG,
"RADIUS: Message removed from queue - restart from beginning");
entry = radius->msgs;
prev = NULL;
continue;
}
if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) {
if (entry->msg_type == RADIUS_ACCT ||
entry->msg_type == RADIUS_ACCT_INTERIM)