linux-kernel - [PATCH 5.7 389/477] crypto: hisilicon

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Date:   Tue, 23 Jun 2020 21:56:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 389/477] crypto: hisilicon - Cap block size at 2^31

From: Herbert Xu <herbert@...dor.apana.org.au>

[ Upstream commit c61e5644c69775ae9d54b86018fca238aca64a9b ]

The function hisi_acc_create_sg_pool may allocate a block of
memory of size PAGE_SIZE * 2^(MAX_ORDER - 1).  This value may
exceed 2^31 on ia64, which would overflow the u32.

This patch caps it at 2^31.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: d8ac7b85236b ("crypto: hisilicon - fix large sgl memory...")
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/hisilicon/sgl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c
index 0e8c7e324fb46..725a739800b0a 100644
--- a/drivers/crypto/hisilicon/sgl.c
+++ b/drivers/crypto/hisilicon/sgl.c
@@ -66,7 +66,8 @@ struct hisi_acc_sgl_pool *hisi_acc_create_sgl_pool(struct device *dev,
 
 	sgl_size = sizeof(struct acc_hw_sge) * sge_nr +
 		   sizeof(struct hisi_acc_hw_sgl);
-	block_size = PAGE_SIZE * (1 << (MAX_ORDER - 1));
+	block_size = 1 << (PAGE_SHIFT + MAX_ORDER <= 32 ?
+			   PAGE_SHIFT + MAX_ORDER - 1 : 31);
 	sgl_num_per_block = block_size / sgl_size;
 	block_num = count / sgl_num_per_block;
 	remain_sgl = count % sgl_num_per_block;
-- 
2.25.1