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signal: check sig before setting info in kill_pid_usb_asyncio

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

Zhiqiang Liu committed 6 years ago

Commit eaec2b01 parent 8f3d9f31 file · +3 −3Browse files

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kernel/signal.c+3−3
@@ -1510,15 +1510,15 @@ int kill_pid_usb_asyncio(int sig, int errno, sigval_t addr, · 1509 unmodified lines
15101510 unsigned long flags;
15111511 int ret = -EINVAL;
15121512
1513+ if (!valid_signal(sig))
1514+ return ret;
1515+
15131516 clear_siginfo(&info);
15141517 info.si_signo = sig;
15151518 info.si_errno = errno;
15161519 info.si_code = SI_ASYNCIO;
15171520 *((sigval_t *)&info.si_pid) = addr;
15181521
1519− if (!valid_signal(sig))
1520− return ret;
1521−
15221522 rcu_read_lock();
15231523 p = pid_task(pid, PIDTYPE_PID);
15241524 if (!p) {