From: Tianjia Zhang tianjia.zhang@linux.alibaba.com
commit 5961060692f8b17cd2080620a3d27b95d2ae05ca upstream.
When the TLS cipher suite uses CCM mode, including AES CCM and SM4 CCM, the first byte of the B0 block is flags, and the real IV starts from the second byte. The XOR operation of the IV and rec_seq should be skip this byte, that is, add the iv_offset.
Fixes: f295b3ae9f59 ("net/tls: Add support of AES128-CCM based ciphers") Signed-off-by: Tianjia Zhang tianjia.zhang@linux.alibaba.com Cc: Vakul Garg vakul.garg@nxp.com Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/tls/tls_sw.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -512,7 +512,7 @@ static int tls_do_encryption(struct sock memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv, prot->iv_size + prot->salt_size);
- xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq); + xor_iv_with_seq(prot->version, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq);
sge->offset += prot->prepend_size; sge->length -= prot->prepend_size; @@ -1483,7 +1483,7 @@ static int decrypt_internal(struct sock else memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
- xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq); + xor_iv_with_seq(prot->version, iv + iv_offset, tls_ctx->rx.rec_seq);
/* Prepare AAD */ tls_make_aad(aad, rxm->full_len - prot->overhead_size +