From 817a2d0c98ca035e2a906c04a4e2509103c583b1 Mon Sep 17 00:00:00 2001
From: Matt Mullins <mokomull@gmail.com>
Date: Mon, 24 Feb 2014 15:03:52 -0800
Subject: [PATCH] core: do not segfault if /proc/swaps cannot be opened

The refactoring in f84b1b1ff9b1261 ('core: do not segfault if swap
activity happens when /proc/swaps is not open') caused
swap_dispatch_reload and swap_enumerate to continue even if fopen()
failed with ENOENT.

This should instead be modified to return from swap_dispatch_reload and
swap_enumerate, rather than continuing to load the list of swaps when
m->proc_swaps is NULL.

https://bugzilla.redhat.com/show_bug.cgi?id=1069393
---
 src/core/swap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/core/swap.c b/src/core/swap.c
index 727bb95..3c009da 100644
--- a/src/core/swap.c
+++ b/src/core/swap.c
@@ -1074,7 +1074,7 @@ static int open_proc_swaps(Manager *m) {
 
                 m->proc_swaps = fopen("/proc/swaps", "re");
                 if (!m->proc_swaps)
-                        return (errno == ENOENT) ? 0 : -errno;
+                        return -errno;
 
                 m->swap_watch.type = WATCH_SWAP;
                 m->swap_watch.fd = fileno(m->proc_swaps);
@@ -1097,7 +1097,7 @@ int swap_dispatch_reload(Manager *m) {
 
         r = open_proc_swaps(m);
         if (r < 0)
-                return r;
+                return (r == -ENOENT) ? 0 : r;
 
         return swap_fd_event(m, EPOLLPRI);
 }
@@ -1250,7 +1250,7 @@ static int swap_enumerate(Manager *m) {
 
         r = open_proc_swaps(m);
         if (r < 0)
-                return r;
+                return (r == -ENOENT) ? 0 : r;
 
         r = swap_load_proc_swaps(m, false);
         if (r < 0)