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Bluetooth: avoid u128_xor() on potentially misaligned inputs

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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>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Ard Biesheuvel
2021-01-05 17:10:53 +01:00
committed by Marcel Holtmann
parent b649813ead
commit ef0bb5adc1
1 changed files with 2 additions and 3 deletions
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5
net/bluetooth/smp.c
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@@ -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);