netdev - RE: [Intel-wired-lan] [PATCH net-next] ixgbe: fix signed-integer-overflow warning

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Date:   Thu, 7 May 2020 20:37:02 +0000
From:   "Bowers, AndrewX" <andrewx.bowers@...el.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH net-next] ixgbe: fix
 signed-integer-overflow warning

-----Original Message-----
From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Xie XiuQi
Sent: Monday, May 4, 2020 7:45 PM
To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; davem@...emloft.net
Cc: netdev@...r.kernel.org; intel-wired-lan@...ts.osuosl.org; linux-kernel@...r.kernel.org
Subject: [Intel-wired-lan] [PATCH net-next] ixgbe: fix signed-integer-overflow warning

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 <hulkci@...wei.com>
Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


Tested-by: Andrew Bowers <andrewx.bowers@...el.com>