4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Ard Biesheuvel <ard.biesheu...@linaro.org> commit 969e2f59d589c15f6aaf306e590dde16f12ea4b3 upstream. Commit 5092fcf34908 ("crypto: arm64/aes-ce-ccm: add non-SIMD generic fallback") introduced C fallback code to replace the NEON routines when invoked from a context where the NEON is not available (i.e., from the context of a softirq taken while the NEON is already being used in kernel process context) Fix two logical flaws in the MAC calculation of the associated data. Reported-by: Eric Biggers <ebigg...@kernel.org> Fixes: 5092fcf34908 ("crypto: arm64/aes-ce-ccm: add non-SIMD generic fallback") Cc: sta...@vger.kernel.org Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/arm64/crypto/aes-ce-ccm-glue.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/arch/arm64/crypto/aes-ce-ccm-glue.c +++ b/arch/arm64/crypto/aes-ce-ccm-glue.c @@ -123,7 +123,7 @@ static void ccm_update_mac(struct crypto abytes -= added; } - while (abytes > AES_BLOCK_SIZE) { + while (abytes >= AES_BLOCK_SIZE) { __aes_arm64_encrypt(key->key_enc, mac, mac, num_rounds(key)); crypto_xor(mac, in, AES_BLOCK_SIZE); @@ -137,8 +137,6 @@ static void ccm_update_mac(struct crypto num_rounds(key)); crypto_xor(mac, in, abytes); *macp = abytes; - } else { - *macp = 0; } } }