i40e: fix MMIO write access to an invalid page in i40e_clear_hw

[ Upstream commit 015bac5daca978448f2671478c553ce1f300c21e ]

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 <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/T/
Reviewed-by: Przemek Kitszel <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Aleksandr Loktionov <[email protected]>
Tested-by: Rinitha S <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Kyungwook Boo

drivers/net/ethernet/intel/i40e/i40e_common.c

@@ -1320,10 +1320,11 @@ i40e_status 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;