[PATCH 4/4] nitb: Fix IMSI/IMEI buffer handling (Coverity)

Currently the handling of the buffers is not done consistently. Some code assumes that the whole buffer may be used to store the string while at other places, the last buffer byte is left untouched in the assumption that it contains a terminating NUL-character. The latter is the correct behaviour. This commit changes to code to not touch the last byte in the buffers and to rely on the last byte being NUL. So the maximum IMSI/IMEI length is GSM_IMSI_LENGTH-1/GSM_IMEI_LENGTH-1. Fixes: Coverity CID 1206568, 1206567 Sponsored-by: On-Waves ehf --- openbsc/src/libcommon/gsm_subscriber_base.c | 3 +-- openbsc/src/libmsc/db.c | 2 +- openbsc/src/osmo-bsc_nat/bsc_ussd.c | 2 +- 3 files changed, 3 insertions(+), 4 deletions(-) diff --git a/openbsc/src/libcommon/gsm_subscriber_base.c b/openbsc/src/libcommon/gsm_subscriber_base.c index 3c56101..a455824 100644 --- a/openbsc/src/libcommon/gsm_subscriber_base.c +++ b/openbsc/src/libcommon/gsm_subscriber_base.c @@ -112,8 +112,7 @@ struct gsm_subscriber *subscr_get_or_create(struct gsm_subscriber_group *sgrp, if (!subscr) return NULL; - strncpy(subscr->imsi, imsi, GSM_IMSI_LENGTH); - subscr->imsi[GSM_IMSI_LENGTH - 1] = '\0'; + strncpy(subscr->imsi, imsi, GSM_IMSI_LENGTH-1); subscr->group = sgrp; return subscr; } diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c index bdecbb4..ee678b6 100644 --- a/openbsc/src/libmsc/db.c +++ b/openbsc/src/libmsc/db.c @@ -802,7 +802,7 @@ static void db_set_from_query(struct gsm_subscriber *subscr, dbi_conn result) const char *string; string = dbi_result_get_string(result, "imsi"); if (string) - strncpy(subscr->imsi, string, GSM_IMSI_LENGTH); + strncpy(subscr->imsi, string, GSM_IMSI_LENGTH-1); string = dbi_result_get_string(result, "tmsi"); if (string) diff --git a/openbsc/src/osmo-bsc_nat/bsc_ussd.c b/openbsc/src/osmo-bsc_nat/bsc_ussd.c index ac5a9f5..67844b8 100644 --- a/openbsc/src/osmo-bsc_nat/bsc_ussd.c +++ b/openbsc/src/osmo-bsc_nat/bsc_ussd.c @@ -399,7 +399,7 @@ int bsc_ussd_check(struct nat_sccp_connection *con, struct bsc_nat_parsed *parse if (parsed->bssap != BSSAP_MSG_DTAP) return 0; - if (strlen(con->imsi) > GSM_IMSI_LENGTH) + if (strlen(con->imsi) >= GSM_IMSI_LENGTH) return 0; hdr48 = bsc_unpack_dtap(parsed, msg, &len); -- 1.9.1