crypto: hisilicon - Fix double free in sec_free_hw_sgl()

[ Upstream commit 24fbf7bad888767bed952f540ac963bc57e47e15 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/hisilicon/sec/sec_algs.c b/drivers/crypto/hisilicon/sec/sec_algs.c
index cdc4f9a..db2983c 100644 (file)
--- a/drivers/crypto/hisilicon/sec/sec_algs.c
+++ b/drivers/crypto/hisilicon/sec/sec_algs.c
@@ -215,17 +215,18 @@ static void sec_free_hw_sgl(struct sec_hw_sgl *hw_sgl,
                            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,