linux-kernel - [PATCH AUTOSEL 5.4 04/26] signal: check sig before setting info in kill_pid_usb

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Message-Id: <20200424122323.10194-4-sashal@kernel.org>
Date:   Fri, 24 Apr 2020 08:23:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhiqiang Liu <liuzhiqiang26@...wei.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.4 04/26] signal: check sig before setting info in kill_pid_usb_asyncio

From: Zhiqiang Liu <liuzhiqiang26@...wei.com>

[ Upstream commit eaec2b0bd30690575c581eebffae64bfb7f684ac ]

In kill_pid_usb_asyncio, if signal is not valid, we do not need to
set info struct.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Link: https://lore.kernel.org/r/f525fd08-1cf7-fb09-d20c-4359145eb940@huawei.com
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/signal.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 7d3d35eb7a0ba..3498a009eeac3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1510,15 +1510,15 @@ int kill_pid_usb_asyncio(int sig, int errno, sigval_t addr,
 	unsigned long flags;
 	int ret = -EINVAL;
 
+	if (!valid_signal(sig))
+		return ret;
+
 	clear_siginfo(&info);
 	info.si_signo = sig;
 	info.si_errno = errno;
 	info.si_code = SI_ASYNCIO;
 	*((sigval_t *)&info.si_pid) = addr;
 
-	if (!valid_signal(sig))
-		return ret;
-
 	rcu_read_lock();
 	p = pid_task(pid, PIDTYPE_PID);
 	if (!p) {
-- 
2.20.1