2021-11-04 13:29:05

by YE Chengfeng

Subject: [PATCH] crypto: qce: fix uaf on qce_aead_register_one

Pointer alg points to sub field of tmpl, it
is dereferenced after tmpl is freed. Fix
this by accessing alg before free tmpl.

Fixes: 9363efb4 ("crypto: qce - Add support for AEAD algorithms")
Signed-off-by: Chengfeng Ye <[email protected]>
---
drivers/crypto/qce/aead.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/aead.c b/drivers/crypto/qce/aead.c
index 290e2446a2f3..97a530171f07 100644
--- a/drivers/crypto/qce/aead.c
+++ b/drivers/crypto/qce/aead.c
@@ -802,8 +802,8 @@ static int qce_aead_register_one(const struct qce_aead_def *def, struct qce_devi

ret = crypto_register_aead(alg);
if (ret) {
- kfree(tmpl);
dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
+ kfree(tmpl);
return ret;
}

--
2.17.1

2021-11-05 23:33:44

by Thara Gopinath

Subject: Re: [PATCH] crypto: qce: fix uaf on qce_aead_register_one

On 11/4/21 9:28 AM, Chengfeng Ye wrote:
> Pointer alg points to sub field of tmpl, it
> is dereferenced after tmpl is freed. Fix
> this by accessing alg before free tmpl.
>
> Fixes: 9363efb4 ("crypto: qce - Add support for AEAD algorithms")
> Signed-off-by: Chengfeng Ye <[email protected]>


Acked-by: Thara Gopinath <[email protected]>

--
Warm Regards
Thara (She/Her/Hers)
> ---
> drivers/crypto/qce/aead.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/qce/aead.c b/drivers/crypto/qce/aead.c
> index 290e2446a2f3..97a530171f07 100644
> --- a/drivers/crypto/qce/aead.c
> +++ b/drivers/crypto/qce/aead.c
> @@ -802,8 +802,8 @@ static int qce_aead_register_one(const struct qce_aead_def *def, struct qce_devi
>
> ret = crypto_register_aead(alg);
> if (ret) {
> - kfree(tmpl);
> dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
> + kfree(tmpl);
> return ret;
> }
>
>

2021-11-20 04:30:10

by Herbert Xu

Subject: Re: [PATCH] crypto: qce: fix uaf on qce_aead_register_one

On Thu, Nov 04, 2021 at 06:28:07AM -0700, Chengfeng Ye wrote:
> Pointer alg points to sub field of tmpl, it
> is dereferenced after tmpl is freed. Fix
> this by accessing alg before free tmpl.
>
> Fixes: 9363efb4 ("crypto: qce - Add support for AEAD algorithms")
> Signed-off-by: Chengfeng Ye <[email protected]>
> ---
> drivers/crypto/qce/aead.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Patch applied. Thanks.
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt