[PATCH 4.9 113/240] crypto: qat - Fix a double free in adf_create_ring

Greg Kroah-Hartman
2021-05-20T11:16:25Z

From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>

[ Upstream commit f7cae626cabb3350b23722b78fe34dd7a615ca04 ]

In adf_create_ring, if the callee adf_init_ring() failed, the callee will
free the ring->base_addr by dma_free_coherent() and return -EFAULT. Then
adf_create_ring will goto err and the ring->base_addr will be freed again
in adf_cleanup_ring().

My patch sets ring->base_addr to NULL after the first freed to avoid the
double free.

Fixes: a672a9dc872ec ("crypto: qat - Intel(R) QAT transport code")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/crypto/qat/qat_common/adf_transport.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/qat/qat_common/adf_transport.c b/drivers/crypto/qat/qat_common/adf_transport.c
index 57d2622728a5..4c0067f8c079 100644
--- a/drivers/crypto/qat/qat_common/adf_transport.c
+++ b/drivers/crypto/qat/qat_common/adf_transport.c
@@ -197,6 +197,7 @@ static int adf_init_ring(struct adf_etr_ring_data *ring)
dev_err(&GET_DEV(accel_dev), "Ring address not aligned\n");
dma_free_coherent(&GET_DEV(accel_dev), ring_size_bytes,
ring->base_addr, ring->dma_addr);
+ ring->base_addr = NULL;
return -EFAULT;
}

--
2.30.2