4.9-stable review patch. If anyone has any objections, please let me know.
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From: Jia-Ju Bai baijiaju1990@163.com
[ Upstream commit 93818da5eed63fbc17b64080406ea53b86b23309 ]
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@163.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/isdn/mISDN/stack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/isdn/mISDN/stack.c +++ b/drivers/isdn/mISDN/stack.c @@ -72,7 +72,7 @@ send_socklist(struct mISDN_sock_list *sl 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;