Subject: [PATCH] crypto: sun4i-ss: erase key after use

From: Corentin Labbe <[email-masked]>
Date: Sun, 15 Sep 2019 20:35:36 +0200

When a TFM is unregistered, the sun4i-ss driver does not clean the key used,
leaking it in memory.
This patch adds this absent key cleaning.

Fixes: 6298e948215f ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <[email-masked]> # 4.3+
Signed-off-by: Corentin Labbe <[email-masked]>
---
 drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
index fa4b1b47822e..60d99370a4ec 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
@@ -503,6 +503,8 @@ int sun4i_ss_cipher_init(struct crypto_tfm *tfm)
 void sun4i_ss_cipher_exit(struct crypto_tfm *tfm)
 {
 	struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
+
+	memzero_explicit(op->key, op->keylen);
 	crypto_free_sync_skcipher(op->fallback_tfm);
 }
 
-- 
2.21.0

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