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SubjectRe: [PATCH] net: tipc: Fix a sleep-in-atomic bug in tipc_msg_reverse
From
From: Jia-Ju Bai <baijiaju1990@163.com>
Date: Sat, 10 Jun 2017 17:03:35 +0800

> The kernel may sleep under a rcu read lock in tipc_msg_reverse, and the
> function call path is:
> tipc_l2_rcv_msg (acquire the lock by rcu_read_lock)
> tipc_rcv
> tipc_sk_rcv
> tipc_msg_reverse
> pskb_expand_head(GFP_KERNEL) --> may sleep
> tipc_node_broadcast
> tipc_node_xmit_skb
> tipc_node_xmit
> tipc_sk_rcv
> tipc_msg_reverse
> pskb_expand_head(GFP_KERNEL) --> may sleep
>
> To fix it, "GFP_KERNEL" is replaced with "GFP_ATOMIC".
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>

Applied and queued up for -stable.

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