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crypto: hisilicon - Cap block size at 2^31

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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: d8ac7b8523 ("crypto: hisilicon - fix large sgl memory...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2020-06-04 17:37:50 +10:00
parent 7cf8195470
commit c61e5644c6
1 changed files with 2 additions and 1 deletions
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3
drivers/crypto/hisilicon/sgl.c
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@ -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;