[PATCH 42/64] net: qede: Use memset_after() for counters

Kees Cook
2021-07-27T21:07:13Z

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_after() so memset() doesn't get confused about writing
beyond the destination member that is intended to be the starting point
of zeroing through the end of the struct.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
The old code seems to be doing the wrong thing: starting from not the
first member, but sized for the whole struct. Which is correct?
---
drivers/net/ethernet/qlogic/qede/qede_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 01ac1e93d27a..309dfe8c94fb 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -2419,7 +2419,7 @@ static int qede_load(struct qede_dev *edev, enum qede_load_mode mode,
goto out;
err4:
qede_sync_free_irqs(edev);
- memset(&edev->int_info.msix_cnt, 0, sizeof(struct qed_int_info));
+ memset_after(&edev->int_info, 0, msix);
err3:
qede_napi_disable_remove(edev);
err2:
--
2.30.2