src: more robust ipaccess_idtag_parse()
Now ipaccess_idtag_parse() returns -EINVAL instead of -1. We also
check for the return value of this function in every invocation to
skip further processing in case of messages with malformed TLVs.
This idea was suggested by Zecke.
diff --git a/openbsc/src/libabis/input/ipaccess.c b/openbsc/src/libabis/input/ipaccess.c
index c4c13d7..ba641a8 100644
--- a/openbsc/src/libabis/input/ipaccess.c
+++ b/openbsc/src/libabis/input/ipaccess.c
@@ -123,7 +123,7 @@
if (t_len > len + 1) {
LOGP(DMI, LOGL_ERROR, "The tag does not fit: %d\n", t_len);
- return -1;
+ return -EINVAL;
}
DEBUGPC(DMI, "%s='%s' ", ipaccess_idtag_name(t_tag), cur);
@@ -251,7 +251,7 @@
u_int16_t site_id = 0, bts_id = 0, trx_id = 0;
struct gsm_bts *bts;
char *unitid;
- int len;
+ int len, ret;
/* handle base messages */
ipaccess_rcvmsg_base(msg, bfd);
@@ -260,10 +260,14 @@
case IPAC_MSGT_ID_RESP:
DEBUGP(DMI, "ID_RESP ");
/* parse tags, search for Unit ID */
- ipaccess_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2,
- msgb_l2len(msg)-2);
+ ret = ipaccess_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2,
+ msgb_l2len(msg)-2);
DEBUGP(DMI, "\n");
-
+ if (ret < 0) {
+ LOGP(DINP, LOGL_ERROR, "ignoring IPA response message "
+ "with malformed TLVs\n");
+ return ret;
+ }
if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT))
break;