linux-kernel - [PATCH] mISDN: Fix a sleep-in-atomic bug

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Message-Id: <1496214505-15155-1-git-send-email-baijiaju1990@163.com>
Date:   Wed, 31 May 2017 15:08:25 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     isdn@...ux-pingi.de, mingo@...nel.org, fweisbec@...il.com,
        geliangtang@...il.com, akpm@...ux-foundation.org,
        davem@...emloft.net, yamada.masahiro@...ionext.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH] mISDN: Fix a sleep-in-atomic bug

The driver may sleep under a read spin lock, and the function call path is:
send_socklist (acquire the lock by read_lock)
  skb_copy(GFP_KERNEL) --> may sleep

To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/isdn/mISDN/stack.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c
index 8b7faea..422dced 100644
--- a/drivers/isdn/mISDN/stack.c
+++ b/drivers/isdn/mISDN/stack.c
@@ -75,7 +75,7 @@
 		if (sk->sk_state != MISDN_BOUND)
 			continue;
 		if (!cskb)
-			cskb = skb_copy(skb, GFP_KERNEL);
+			cskb = skb_copy(skb, GFP_ATOMIC);
 		if (!cskb) {
 			printk(KERN_WARNING "%s no skb\n", __func__);
 			break;
-- 
1.7.9.5