[PATCH 4/6] Bluetooth: SMP: clear the aes_cmac_key when done

[Thomas Huth <thuth@redhat.com>]

From: Thomas Huth <thuth@redhat.com>

Clear the local aes_cmac_key structure via __cleanup() function
when we're done with it to avoid that sensitive data could leak on
the stack.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 net/bluetooth/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 031d3022cb1e5..ed30ca0d773f1 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -164,7 +164,7 @@ static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
 static int smp_aes_cmac(const u8 k[16], const u8 *m, size_t len, u8 mac[16])
 {
 	uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
-	struct aes_cmac_key key;
+	struct aes_cmac_key key __cleanup(aes_cmac_zeroize_key);
 	int err;
 
 	if (len > CMAC_MSG_MAX)
-- 
2.55.0