Subject: [PATCH AUTOSEL 5.7 252/274] ixgbe: fix signed-integer-overflow warning

From: Sasha Levin <[email-masked]>
Date: Mon, 8 Jun 2020 19:05:45 -0400

From: Xie XiuQi <[email-masked]>

[ Upstream commit 3b70683fc4d68f5d915d9dc7e5ba72c732c7315c ]

ubsan report this warning, fix it by adding a unsigned suffix.

UBSAN: signed-integer-overflow in
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:2246:26
65535 * 65537 cannot be represented in type 'int'
CPU: 21 PID: 7 Comm: kworker/u256:0 Not tainted 5.7.0-rc3-debug+ #39
Hardware name: Huawei TaiShan 2280 V2/BC82AMDC, BIOS 2280-V2 03/27/2020
Workqueue: ixgbe ixgbe_service_task [ixgbe]
Call trace:
 dump_backtrace+0x0/0x3f0
 show_stack+0x28/0x38
 dump_stack+0x154/0x1e4
 ubsan_epilogue+0x18/0x60
 handle_overflow+0xf8/0x148
 __ubsan_handle_mul_overflow+0x34/0x48
 ixgbe_fc_enable_generic+0x4d0/0x590 [ixgbe]
 ixgbe_service_task+0xc20/0x1f78 [ixgbe]
 process_one_work+0x8f0/0xf18
 worker_thread+0x430/0x6d0
 kthread+0x218/0x238
 ret_from_fork+0x10/0x18

Reported-by: Hulk Robot <[email-masked]>
Signed-off-by: Xie XiuQi <[email-masked]>
Tested-by: Andrew Bowers <[email-masked]>
Signed-off-by: Jeff Kirsher <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 0bd1294ba517..39c5e6fdb72c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -2243,7 +2243,7 @@ s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw)
 	}
 
 	/* Configure pause time (2 TCs per register) */
-	reg = hw->fc.pause_time * 0x00010001;
+	reg = hw->fc.pause_time * 0x00010001U;
 	for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
 		IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);
 
-- 
2.25.1