From 7ff33fae6f9cd79c0e012671c37a172e9a681d0b Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Fri, 24 Feb 2023 13:52:32 -0600
Subject: [PATCH] get_pidfd_from_fd: return -1 on error, not 0

Fixes: 6974df39a: newuidmap and newgidmap: support passing pid as fd
Signed-off-by: Serge Hallyn <serge@hallyn.com>
---
 lib/get_pid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/get_pid.c b/lib/get_pid.c
index ab91d158..5b6d9da4 100644
--- a/lib/get_pid.c
+++ b/lib/get_pid.c
@@ -35,6 +35,7 @@ int get_pid (const char *pidstr, pid_t *pid)
 /*
  * If use passed in fd:4 as an argument, then return the
  * value '4', the fd to use.
+ * On error, return -1.
  */
 int get_pidfd_from_fd(const char *pidfdstr)
 {
@@ -47,7 +48,7 @@ int get_pidfd_from_fd(const char *pidfdstr)
 	    || ('\0' != *endptr)
 	    || (ERANGE == errno)
 	    || (/*@+longintegral@*/val != (pid_t)val)/*@=longintegral@*/) {
-		return 0;
+		return -1;
 	}
 
 	return (int)val;