[PATCH 03/10] PMKSA: Guard against NULL KCK

[benjamin at sipsolutions.net]

From: Benjamin Berg <benjamin.berg at intel.com>

If the kck_len is 0 then the pointer may be NULL. If that happens UBSAN
complains about the NULL pointer as memcpy has the arguments declared to
never be NULL.

Signed-off-by: Benjamin Berg <benjamin.berg at intel.com>
---
 src/rsn_supp/pmksa_cache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/rsn_supp/pmksa_cache.c b/src/rsn_supp/pmksa_cache.c
index f90dcd9b0a..5bfcbd27e8 100644
--- a/src/rsn_supp/pmksa_cache.c
+++ b/src/rsn_supp/pmksa_cache.c
@@ -253,7 +253,8 @@ pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
 		return NULL;
 	os_memcpy(entry->pmk, pmk, pmk_len);
 	entry->pmk_len = pmk_len;
-	os_memcpy(entry->kck, kck, kck_len);
+	if (kck_len > 0)
+		os_memcpy(entry->kck, kck, kck_len);
 	entry->kck_len = kck_len;
 	if (pmkid)
 		os_memcpy(entry->pmkid, pmkid, PMKID_LEN);
-- 
2.45.1