gtp: Fix buffer overflow in imsi_gtp2str()

The string buffer allocated for the IMSI must be sized for a length
twice the number of input bytes (each byte has two nibbles) plus 1
byte for NUL.  We missed the "twice" part :/

Change-Id: I1ecaa811815ae522af71feabc5d0c1ea8b4edde9
Fixes: Coverity CID#174336

1 files changed, 1 insertions, 1 deletions

diff --git a/gtp/gtp.c b/gtp/gtp.c
index 3051aaa..c798192 100644
--- a/gtp/gtp.c
+++ b/gtp/gtp.c
@@ -3301,7 +3301,7 @@ int in_addr2gsna(struct ul16_t *gsna, struct in_addr *src)
  * _network byte order_ to contain BCD digits ?!? */
 const char *imsi_gtp2str(const uint64_t *imsi)
 {
-	static char buf[sizeof(*imsi)+1];
+	static char buf[sizeof(*imsi)*2+1];
 	const uint8_t *imsi8 = (const uint8_t *) imsi;
 	unsigned int i, j = 0;