From: cptpcrd <cptpcrd.git@gmail.com>
Date: Sun, 7 Feb 2021 19:22:21 +0000 (-0500)
Subject: closefrom: Handle lowfd < 0 properly
X-Git-Tag: 0.11.2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4fca5bb4fcf8509cb93db6e20314f22994c093b;p=thirdparty%2Flibbsd.git

closefrom: Handle lowfd < 0 properly

More important if close_range() is going to be used, since casting
negative values to 'unsigned int' might hide the errors.

[guillem@hadrons.org: Minor coding style fix. ]

Signed-off-by: Guillem Jover <guillem@hadrons.org>
---

diff --git a/src/closefrom.c b/src/closefrom.c
index be38813..e2e10a8 100644
--- a/src/closefrom.c
+++ b/src/closefrom.c
@@ -179,6 +179,9 @@ closefrom_procfs(int lowfd)
 void
 closefrom(int lowfd)
 {
+	if (lowfd < 0)
+		lowfd = 0;
+
 	/* Try the fast method first, if possible. */
 #if defined(HAVE_FCNTL_CLOSEM)
 	if (fcntl(lowfd, F_CLOSEM, 0) != -1)