[PATCH] Bluetooth: avoid u128_xor() on potentially misaligned inputs
From: Ard Biesheuvel <ardb@kernel.org>
Date: 2021-01-05 16:11:40
Also in:
linux-bluetooth, lkml
Subsystem:
bluetooth subsystem, the rest · Maintainers:
Marcel Holtmann, Luiz Augusto von Dentz, Linus Torvalds
u128_xor() takes pointers to quantities that are assumed to be at least 64-bit aligned, which is not guaranteed to be the case in the smp_c1() routine. So switch to crypto_xor() instead. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- net/bluetooth/smp.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index c659c464f7ca..b0c1ee110eff 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c@@ -25,7 +25,6 @@ #include <linux/crypto.h> #include <crypto/aes.h> #include <crypto/algapi.h> -#include <crypto/b128ops.h> #include <crypto/hash.h> #include <crypto/kpp.h>
@@ -425,7 +424,7 @@ static int smp_c1(const u8 k[16], SMP_DBG("p1 %16phN", p1); /* res = r XOR p1 */ - u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); + crypto_xor_cpy(res, r, p1, sizeof(p1)); /* res = e(k, res) */ err = smp_e(k, res);
@@ -442,7 +441,7 @@ static int smp_c1(const u8 k[16], SMP_DBG("p2 %16phN", p2); /* res = res XOR p2 */ - u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); + crypto_xor(res, p2, sizeof(p2)); /* res = e(k, res) */ err = smp_e(k, res);
--
2.17.1