From cb9d97de05646de69b997da0137b94e00cba7f99 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Thu, 30 Apr 2020 21:57:32 +0200
Subject: [PATCH] r8169: improve rtl_coalesce_choose_scale
Git-commit: cb9d97de05646de69b997da0137b94e00cba7f99
Patch-mainline: v5.8-rc1
References: bsc#1175746

The time limit provided by userspace is multiplied with 1000,
what could result in an overflow. Therefore change the time limit
parameter unit from ns to us, and avoid the problematic operation.
If there's no matching scale because provided time limit is too big,
return ERANGE instead of EINVAL to provide a hint to the user what's
wrong.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/ethernet/realtek/r8169_main.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index a36a48f713fa..6c17c234bc06 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1854,8 +1854,8 @@ static int rtl_get_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
 	return 0;
 }
 
-/* choose appropriate scale factor and CPlusCmd[0:1] for (speed, nsec) */
-static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 nsec,
+/* choose appropriate scale factor and CPlusCmd[0:1] for (speed, usec) */
+static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 usec,
 				     u16 *cp01)
 {
 	const struct rtl_coalesce_info *ci;
@@ -1866,13 +1866,13 @@ static int rtl_coalesce_choose_scale(struct rtl8169_private *tp, u32 nsec,
 		return PTR_ERR(ci);
 
 	for (i = 0; i < 4; i++) {
-		if (nsec <= ci->scale_nsecs[i] * RTL_COALESCE_T_MAX) {
+		if (usec <= ci->scale_nsecs[i] * RTL_COALESCE_T_MAX / 1000U) {
 			*cp01 = i;
 			return ci->scale_nsecs[i];
 		}
 	}
 
-	return -EINVAL;
+	return -ERANGE;
 }
 
 static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
@@ -1886,13 +1886,14 @@ static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
 		{ ec->tx_max_coalesced_frames, ec->tx_coalesce_usecs }
 	}, *p = coal_settings;
 	u16 w = 0, cp01 = 0;
+	u32 coal_usec_max;
 	int scale, i;
 
 	if (rtl_is_8125(tp))
 		return -EOPNOTSUPP;
 
-	scale = rtl_coalesce_choose_scale(tp,
-			max(p[0].usecs, p[1].usecs) * 1000, &cp01);
+	coal_usec_max = max(ec->rx_coalesce_usecs, ec->tx_coalesce_usecs);
+	scale = rtl_coalesce_choose_scale(tp, coal_usec_max, &cp01);
 	if (scale < 0)
 		return scale;
 
-- 
2.16.4