gbproxy: Fix parser to accept GSM 24.008 Attach Req messages
Currently the parse expects a 'MS network capability' IE with
2 <= length <= 3 which is compliant to GSM 04.08, 9.4.1 but not to
GSM 24.008, 9.4.1 which specifies 3 <= length <= 9. Thus the parser
rejects messages with a length >= 4 (including length field).
This patch relaxes the length check to accept either range by
requiring 2 <= length <= 9.
Ticket: OW#1258
Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gprs_gb_parse.c b/openbsc/src/gprs/gprs_gb_parse.c
index a0a4469..db40e97 100644
--- a/openbsc/src/gprs/gprs_gb_parse.c
+++ b/openbsc/src/gprs/gprs_gb_parse.c
@@ -155,7 +155,7 @@
/* Skip MS network capability */
if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 ||
- value_len < 1 || value_len > 2)
+ value_len < 1 || value_len > 8)
/* invalid */
return 0;;