Commit 504e84ab authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by Herbert Xu
Browse files

crypto: ccree - only try to map auth tag if needed 



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: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Tested-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarGilad Ben-Yossef <gilad@benyossef.com>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ce0fc6db

drivers/crypto/ccree/cc_buffer_mgr.c

+4 −2
Original line number Diff line number Diff line
@@ -1109,9 +1109,11 @@ 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,