crypto: hisilicon - Fix double free in sec_free_hw_sgl()
There are two problems in sec_free_hw_sgl():
First, when sgl_current->next is valid, @hw_sgl will be freed in the
first loop, but it free again after the loop.
Second, sgl_current and sgl_current->next_sgl is not match when
dma_pool_free() is invoked, the third parameter should be the dma
address of sgl_current, but sgl_current->next_sgl is the dma address
of next chain, so use sgl_current->next_sgl is wrong.
Fix this by deleting the last dma_pool_free() in sec_free_hw_sgl(),
modifying the condition for while loop, and matching the address for
dma_pool_free().
Fixes: 915e4e8413da ("crypto: hisilicon - SEC security accelerator driver")
Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/hisilicon/sec/sec_algs.c b/drivers/crypto/hisilicon/sec/sec_algs.c
index e0508ea..aa12633 100644
--- a/drivers/crypto/hisilicon/sec/sec_algs.c
+++ b/drivers/crypto/hisilicon/sec/sec_algs.c
@@ -215,17 +215,18 @@
dma_addr_t psec_sgl, struct sec_dev_info *info)
{
struct sec_hw_sgl *sgl_current, *sgl_next;
+ dma_addr_t sgl_next_dma;
- if (!hw_sgl)
- return;
sgl_current = hw_sgl;
- while (sgl_current->next) {
+ while (sgl_current) {
sgl_next = sgl_current->next;
- dma_pool_free(info->hw_sgl_pool, sgl_current,
- sgl_current->next_sgl);
+ sgl_next_dma = sgl_current->next_sgl;
+
+ dma_pool_free(info->hw_sgl_pool, sgl_current, psec_sgl);
+
sgl_current = sgl_next;
+ psec_sgl = sgl_next_dma;
}
- dma_pool_free(info->hw_sgl_pool, hw_sgl, psec_sgl);
}
static int sec_alg_skcipher_setkey(struct crypto_skcipher *tfm,
