netdev - [PATCH iwl-next v2] i40e: fix MMIO write access to an invalid page in i40e_clear

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Message-ID: <e7e4e5d5-931d-4506-9d75-b87783011379@gmail.com>
Date: Tue, 11 Mar 2025 14:16:02 +0900
From: Kyungwook Boo <bookyungwook@...il.com>
To: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: [PATCH iwl-next v2] i40e: fix MMIO write access to an invalid page in
 i40e_clear_hw

When the device sends a specific input, an integer underflow can occur, leading
to MMIO write access to an invalid page.

Prevent the integer underflow by changing the type of related variables.

Signed-off-by: Kyungwook Boo <bookyungwook@...il.com>
Link: https://lore.kernel.org/lkml/ffc91764-1142-4ba2-91b6-8c773f6f7095@gmail.com/T/
---
Changes in v2:
- Formatting properly
- Fix variable shadowing
- Link to v1: https://lore.kernel.org/netdev/55acc5dc-8d5a-45bc-a59c-9304071e4579@gmail.com/
---
 drivers/net/ethernet/intel/i40e/i40e_common.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 370b4bddee44..b11c35e307ca 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -817,10 +817,11 @@ int i40e_pf_reset(struct i40e_hw *hw)
 void i40e_clear_hw(struct i40e_hw *hw)
 {
 	u32 num_queues, base_queue;
-	u32 num_pf_int;
-	u32 num_vf_int;
+	s32 num_pf_int;
+	s32 num_vf_int;
 	u32 num_vfs;
-	u32 i, j;
+	s32 i;
+	u32 j;
 	u32 val;
 	u32 eol = 0x7ff;
 
---
base-commit: 4d872d51bc9d7b899c1f61534e3dbde72613f627

Best regards,
Kyungwook Boo