crypto: ccree - Fix use after free in cc_cipher_exit()

[ Upstream commit 3d950c34074ed74d2713c3856ba01264523289e6 ]

kfree_sensitive(ctx_p->user.key) will free the ctx_p->user.key. But
ctx_p->user.key is still used in the next line, which will lead to a
use after free.

We can call kfree_sensitive() after dev_dbg() to avoid the uaf.

Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support")
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index 7883349..309da63 100644 (file)
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -257,8 +257,8 @@ static void cc_cipher_exit(struct crypto_tfm *tfm)
                &ctx_p->user.key_dma_addr);
 
        /* Free key buffer in context */
-       kfree_sensitive(ctx_p->user.key);
        dev_dbg(dev, "Free key buffer in context. key=@%p\n", ctx_p->user.key);
+       kfree_sensitive(ctx_p->user.key);
 }
 
 struct tdes_keys {