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From: Bryan Drewery <bdrewery@FreeBSD.org>
Date: Wed, 22 Mar 2017 17:46:08 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r315721 - stable/11/bin/kill
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Author: bdrewery
Date: Wed Mar 22 17:46:08 2017
New Revision: 315721
URL: https://svnweb.freebsd.org/changeset/base/315721

Log:
  MFC r314714:
  
    Don't kill pid -1 on overflow from strtol(3).

Modified:
  stable/11/bin/kill/kill.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/bin/kill/kill.c
==============================================================================
--- stable/11/bin/kill/kill.c	Wed Mar 22 17:37:47 2017	(r315720)
+++ stable/11/bin/kill/kill.c	Wed Mar 22 17:46:08 2017	(r315721)
@@ -66,7 +66,9 @@ static void usage(void);
 int
 main(int argc, char *argv[])
 {
-	int errors, numsig, pid, ret;
+	long pidl;
+	pid_t pid;
+	int errors, numsig, ret;
 	char *ep;
 
 	if (argc < 2)
@@ -137,8 +139,10 @@ main(int argc, char *argv[])
 		else
 #endif
 		{
-			pid = strtol(*argv, &ep, 10);
-			if (!**argv || *ep)
+			pidl = strtol(*argv, &ep, 10);
+			/* Check for overflow of pid_t. */
+			pid = (pid_t)pidl;
+			if (!**argv || *ep || pid != pidl)
 				errx(2, "illegal process id: %s", *argv);
 			ret = kill(pid, numsig);
 		}