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nat: Possible crash fix, only filter non local connections 

For local connections con_msc is not set and sending a RLSD
to the network would have ended up in a segfault.
This commit is contained in:
Holger Hans Peter Freyther 2010-10-06 00:48:36 +08:00
parent e8e41e611f
commit 0c41b6933e
1 changed files with 13 additions and 10 deletions
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23
openbsc/src/nat/bsc_nat.c
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@ -839,17 +839,20 @@ static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg)
case SCCP_MSG_TYPE_IT:
con = patch_sccp_src_ref_to_msc(msg, parsed, bsc);
if (con) {
filter = bsc_nat_filter_dt(bsc, msg, con, parsed);
if (filter < 0) {
bsc_stat_reject(filter, bsc, 1);
bsc_send_con_release(bsc, con);
con = NULL;
goto exit2;
} else {
con_bsc = con->bsc;
con_msc = con->msc_con;
con_filter = con->con_local;
/* only filter non local connections */
if (!con->con_local) {
filter = bsc_nat_filter_dt(bsc, msg, con, parsed);
if (filter < 0) {
bsc_stat_reject(filter, bsc, 1);
bsc_send_con_release(bsc, con);
con = NULL;
goto exit2;
}
}
con_bsc = con->bsc;
con_msc = con->msc_con;
con_filter = con->con_local;
}
break;
case SCCP_MSG_TYPE_RLC: