[openbsc 2/4] gprs: Use RAND_bytes for p-tmsi

[Daniel Willmann]

From: Daniel Willmann <dwillm...@sysmocom.de>

---
 openbsc/src/gprs/gprs_sgsn.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index f40de0b..2af1e97 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -525,7 +525,9 @@ uint32_t sgsn_alloc_ptmsi(void)
        int max_retries = 100;

 restart:
-       ptmsi = rand();
+       if (RAND_bytes(&ptmsi, sizeof(ptmsi)) != 1)
+               goto failed;
+
        /* Enforce that the 2 MSB are set without loosing the distance between
         * identical values. Since rand() has no duplicate values within a
         * period (because the size of the state is the same like the size of
-- 
2.1.4