crypto: hisilicon - Cap block size at 2^31

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@intel.com>
Fixes: d8ac7b85236b ("crypto: hisilicon - fix large sgl memory...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c
index 0e8c7e3..725a739 100644 (file)
--- 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;