[PATCH AUTOSEL 5.6 04/38] signal: check sig before setting info in kill_pid_usb_asyncio

Sasha Levin
2020-04-24T12:33:13Z

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

diff --git a/kernel/signal.c b/kernel/signal.c
index e58a6c619824f..3f94894d1253d 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