From 1e0c380514efeadccd8e6a431f9c9915e5391d95 Mon Sep 17 00:00:00 2001 From: Gilad Ben-Yossef Date: Wed, 29 Jan 2020 16:37:55 +0200 Subject: [PATCH] crypto: ccree - only try to map auth tag if needed [ Upstream commit 504e84abec7a635b861afd8d7f92ecd13eaa2b09 ] Make sure to only add the size of the auth tag to the source mapping for encryption if it is an in-place operation. Failing to do this previously caused us to try and map auth size len bytes from a NULL mapping and crashing if both the cryptlen and assoclen are zero. Reported-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Signed-off-by: Gilad Ben-Yossef Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/ccree/cc_buffer_mgr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c index 77e31191e408ae..630020255941a5 100644 --- a/drivers/crypto/ccree/cc_buffer_mgr.c +++ b/drivers/crypto/ccree/cc_buffer_mgr.c @@ -1242,9 +1242,11 @@ int cc_map_aead_request(struct cc_drvdata *drvdata, struct aead_request *req) } size_to_map = req->cryptlen + areq_ctx->assoclen; - if (areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_ENCRYPT) + /* If we do in-place encryption, we also need the auth tag */ + if ((areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_ENCRYPT) && + (req->src == req->dst)) { size_to_map += authsize; - + } if (is_gcm4543) size_to_map += crypto_aead_ivsize(tfm); rc = cc_map_sg(dev, req->src, size_to_map, DMA_BIDIRECTIONAL,