netdev - [PATCH 1/2] hp100: Fix a possible sleep-in-atomic bug in hp100_login_to_vg

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Message-Id: <1513158468-14382-1-git-send-email-baijiaju1990@gmail.com>
Date:   Wed, 13 Dec 2017 17:47:48 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     perex@...ex.cz, floeff@...hematik.uni-stuttgart.de,
        acme@...ectiva.com.br
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH 1/2] hp100: Fix a possible sleep-in-atomic bug in hp100_login_to_vg_hub

The driver may sleep under a spinlock.
The function call path is:
hp100_set_multicast_list (acquire the spinlock)
  hp100_login_to_vg_hub
    schedule_timeout_interruptible --> may sleep

To fix it, schedule_timeout_interruptible is replaced with udelay.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/net/ethernet/hp/hp100.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/hp/hp100.c b/drivers/net/ethernet/hp/hp100.c
index c8c7ad2..6addcbd 100644
--- a/drivers/net/ethernet/hp/hp100.c
+++ b/drivers/net/ethernet/hp/hp100.c
@@ -2636,8 +2636,7 @@ static int hp100_login_to_vg_hub(struct net_device *dev, u_short force_relogin)
 		do {
 			if (~(hp100_inb(VG_LAN_CFG_1) & HP100_LINK_UP_ST))
 				break;
-			if (!in_interrupt())
-				schedule_timeout_interruptible(1);
+			udelay(10);
 		} while (time_after(time, jiffies));
 
 		/* Start an addressed training and optionally request promiscuous port */
@@ -2672,8 +2671,7 @@ static int hp100_login_to_vg_hub(struct net_device *dev, u_short force_relogin)
 		do {
 			if (hp100_inb(VG_LAN_CFG_1) & HP100_LINK_CABLE_ST)
 				break;
-			if (!in_interrupt())
-				schedule_timeout_interruptible(1);
+			udelay(10);
 		} while (time_before(jiffies, time));
 
 		if (time_after_eq(jiffies, time)) {
@@ -2696,8 +2694,7 @@ static int hp100_login_to_vg_hub(struct net_device *dev, u_short force_relogin)
 #endif
 					break;
 				}
-				if (!in_interrupt())
-					schedule_timeout_interruptible(1);
+				udelay(10);
 			} while (time_after(time, jiffies));
 		}
 
-- 
1.7.9.5