[v5] misc: pci_endpoint_test: Fix overflow of bar_size

Hans Zhang
2025-01-01T15:19:37Z

With 8GB BAR2, running pcitest -b 2 fails with "TEST FAILED".

The return value of the `pci_resource_len` interface is not an integer.
Using `pcitest` with an 8GB BAR2, the bar_size of integer type will
overflow.
Change the data type of bar_size from integer to resource_size_t, to fix
the above issue.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501011917.ugP1ywJV-lkp@intel.com/
Signed-off-by: Hans Zhang <18255117159@163.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

---
Changes since v4:
https://lore.kernel.org/linux-pci/20241231065500.168799-1-18255117159@163.com/

- add base-commit.

Changes since v3:
https://lore.kernel.org/linux-pci/20241221141009.27317-1-18255117159@163.com/

- The patch subject were modified.

Changes since v2:
https://lore.kernel.org/linux-pci/20241220075253.16791-1-18255117159@163.com/

- Fix "changes" part goes below the --- line
- The patch commit message were modified.

Changes since v1:
https://lore.kernel.org/linux-pci/20241217121220.19676-1-18255117159@163.com/

- The patch subject and commit message were modified.
---
drivers/misc/pci_endpoint_test.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 3aaaf47fa4ee..414c4e55fb0a 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -280,10 +280,11 @@ static int pci_endpoint_test_bar_memcmp(struct pci_endpoint_test *test,
static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
enum pci_barno barno)
{
- int j, bar_size, buf_size, iters, remain;
void *write_buf __free(kfree) = NULL;
void *read_buf __free(kfree) = NULL;
struct pci_dev *pdev = test->pdev;
+ int j, buf_size, iters, remain;
+ resource_size_t bar_size;

if (!test->bar[barno])
return false;

base-commit: ccb98ccef0e543c2bd4ef1a72270461957f3d8d0
--
2.25.1