[newlib-cygwin/cygwin-3_3-branch] Cygwin: pthread_kill: check for invalid signal number

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8ddd4c2ff6243208a374e0bcb96c43d1478f8ffd

commit 8ddd4c2ff6243208a374e0bcb96c43d1478f8ffd
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Nov 22 12:19:02 2021 +0100

    Cygwin: pthread_kill: check for invalid signal number
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/thread.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index 7c6a919c0..fcfd75c79 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -3351,6 +3351,10 @@ pthread_kill (pthread_t thread, int sig)
   if (!pthread::is_good_object (&thread))
     return EINVAL;
 
+  /* check that sig is in right range */
+  if (sig < 0 || sig >= _NSIG)
+      return EINVAL;
+
   siginfo_t si = {0};
   si.si_signo = sig;
   si.si_code = SI_USER;