cellular-infrastructure
/
osmo-bsc
mirror of https://gerrit.osmocom.org/osmo-bsc
9
0
Fork 0
Code Issues Releases Wiki Activity

bsc_api: Fix a use after free error in the Clear Request path 

The implementation of bsc_hack would call subscr_con_free before
the BSC API has had the chance to call gsm0808_clear to try to
release other channels. Fix that by adding a return value.
This commit is contained in:
Holger Hans Peter Freyther 2010-11-03 19:01:58 +01:00
parent 85334f1309
commit 05c68841a8
5 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
openbsc/include/openbsc/bsc_api.h
View File

@ -21,7 +21,7 @@ struct bsc_api {
uint16_t rr_cause);
void (*assign_fail)(struct gsm_subscriber_connection *conn,
uint16_t rr_cause);
void (*clear_request)(struct gsm_subscriber_connection *conn,
int (*clear_request)(struct gsm_subscriber_connection *conn,
uint32_t cause);
void (*clear_compl)(struct gsm_subscriber_connection *conn);
};

3
openbsc/src/bsc/osmo_bsc_api.c
View File

@ -52,8 +52,9 @@ static void bsc_assign_fail(struct gsm_subscriber_connection *conn, uint32_t cau
{
}
static void bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
static int bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
{
return 0;
}
static void bsc_clear_compl(struct gsm_subscriber_connection *conn)

6
openbsc/src/bsc_api.c
View File

@ -241,6 +241,7 @@ static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
struct bsc_api *bsc;
struct gsm_lchan *lchan;
struct gsm_subscriber_connection *conn;
int destruct = 1;
if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE)
return 0;
@ -255,7 +256,7 @@ static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
conn = lchan->conn;
if (bsc->clear_request)
bsc->clear_request(conn, 0);
destruct = bsc->clear_request(conn, 0);
/* now give up all channels */
if (conn->lchan == lchan)
@ -264,6 +265,9 @@ static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
conn->ho_lchan = NULL;
gsm0808_clear(conn);
if (destruct)
subscr_con_free(conn);
return 0;
}

2
openbsc/src/gsm_04_08.c
View File

@ -328,8 +328,6 @@ void gsm0408_clear_request(struct gsm_subscriber_connection *conn, uint32_t caus
if (trans->conn == conn)
trans_free(trans);
}
subscr_con_free(conn);
}
/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */

3
openbsc/src/osmo_msc.c
View File

@ -36,9 +36,10 @@ static void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
gsm411_sapi_n_reject(conn);
}
static void msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
static int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
{
gsm0408_clear_request(conn, cause);
return 1;
}
static int msc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,