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

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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: 63ee04c8b4 ("crypto: ccree - add skcipher support")
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jianglei Nie
2022-03-03 10:23:37 +08:00
committed by Herbert Xu
parent 54cce8ecb9
commit 3d950c3407
1 changed files with 1 additions and 1 deletions
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2
drivers/crypto/ccree/cc_cipher.c
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@@ -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 {