linux-kernel - [PATCH 5.15 139/846] crypto: qce - fix uaf on qce_ahash_register

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Message-Id: <20220124184105.788252936@linuxfoundation.org>
Date:   Mon, 24 Jan 2022 19:34:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chengfeng Ye <cyeaa@...nect.ust.hk>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 139/846] crypto: qce - fix uaf on qce_ahash_register_one

From: Chengfeng Ye <cyeaa@...nect.ust.hk>

[ Upstream commit b4cb4d31631912842eb7dce02b4350cbb7562d5e ]

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

Fixes: ec8f5d8f ("crypto: qce - Qualcomm crypto engine driver")
Signed-off-by: Chengfeng Ye <cyeaa@...nect.ust.hk>
Acked-by: Thara Gopinath <thara.gopinath@...aro.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/qce/sha.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/sha.c b/drivers/crypto/qce/sha.c
index 8e6fcf2c21cc0..59159f5e64e52 100644
--- a/drivers/crypto/qce/sha.c
+++ b/drivers/crypto/qce/sha.c
@@ -498,8 +498,8 @@ static int qce_ahash_register_one(const struct qce_ahash_def *def,
 
 	ret = crypto_register_ahash(alg);
 	if (ret) {
-		kfree(tmpl);
 		dev_err(qce->dev, "%s registration failed\n", base->cra_name);
+		kfree(tmpl);
 		return ret;
 	}
 
-- 
2.34.1