Re: [dpdk-dev] [PATCH v2 1/4] raw/skeleton: fix failing test case

[Hemant Agrawal <hemant.agrawal@nxp.com>]

Series-Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>

On 21-Jun-19 9:26 PM, Bruce Richardson wrote:
> Rawdev unit test for setting and getting parameters is failing because
> of a pointer value being dereferenced after the memory it pointed to is
> freed.
>
> The freeing of the malloced memory is difficult when using asserts to
> cause early abort of the test cases, since that can leak memory. The
> original placement of the free call caused a memory leak if the test
> finished early, while a fix for that leak caused the test to fail at
> times due to the memory variable being referenced after free. For a case
> like this, using stack rather than heap memory is just easier and avoids
> all issues.
>
> Fixes: 55ca1b0f2151 ("raw/skeleton: add test cases")
> Fixes: 88d0e47880ec ("raw/skeleton: fix memory leak on test failure")
> Cc: shreyansh.jain@nxp.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
>   drivers/raw/skeleton_rawdev/skeleton_rawdev_test.c | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/raw/skeleton_rawdev/skeleton_rawdev_test.c b/drivers/raw/skeleton_rawdev/skeleton_rawdev_test.c
> index 359c9e296..a0961c77b 100644
> --- a/drivers/raw/skeleton_rawdev/skeleton_rawdev_test.c
> +++ b/drivers/raw/skeleton_rawdev/skeleton_rawdev_test.c
> @@ -274,17 +274,14 @@ static int
>   test_rawdev_attr_set_get(void)
>   {
>   	int ret;
> -	int *dummy_value;
> +	int dummy_value_store;
> +	int *dummy_value = &dummy_value_store;
>   	uint64_t ret_value;
>   
>   	/* Set an attribute and fetch it */
>   	ret = rte_rawdev_set_attr(TEST_DEV_ID, "Test1", 100);
>   	RTE_TEST_ASSERT(!ret, "Unable to set an attribute (Test1)");
>   
> -	dummy_value = malloc(sizeof(int));
> -	if (!dummy_value)
> -		RTE_TEST_ASSERT(1, "Unable to allocate memory (dummy_value)");
> -
>   	*dummy_value = 200;
>   	ret = rte_rawdev_set_attr(TEST_DEV_ID, "Test2", (uintptr_t)dummy_value);
>   
> @@ -294,7 +291,6 @@ test_rawdev_attr_set_get(void)
>   			      "Attribute (Test1) not set correctly (%" PRIu64 ")",
>   			      ret_value);
>   
> -	free(dummy_value);
>   
>   	ret_value = 0;
>   	ret = rte_rawdev_get_attr(TEST_DEV_ID, "Test2", &ret_value);