[PATCH 5.10 094/563] crypto: qce - fix uaf on qce_ahash_register_one

From: Greg Kroah-Hartman
Date: Mon Jan 24 2022 - 15:58:21 EST


From: Chengfeng Ye <cyeaa@xxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxx>
Acked-by: Thara Gopinath <thara.gopinath@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 87be96a0b0bba..8b4e79d882af4 100644
--- a/drivers/crypto/qce/sha.c
+++ b/drivers/crypto/qce/sha.c
@@ -533,8 +533,8 @@ 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