My previous patch 5950ba9 ("lib/namespace: don't leak fd in error case")
was a step in the wrong direction. Instead of closing the opened file
descriptor in error case only, follow a better approach here and close
the fd as soon as it is not used anymore. This way the inelegant goto
statements can be dropped, and the fd leak in non-error case is fixed as
well.
Fixes: 5950ba9 ("lib/namespace: don't leak fd in error case")
Signed-off-by: Phil Sutter <p...@nwl.cc>
---
lib/namespace.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/lib/namespace.c b/lib/namespace.c
index 8197165..30b5138 100644
--- a/lib/namespace.c
+++ b/lib/namespace.c
@@ -58,35 +58,34 @@ int netns_switch(char *name)
if (setns(netns, CLONE_NEWNET) < 0) {
fprintf(stderr, "setting the network namespace \"%s\" failed:
%s\n",
name, strerror(errno));
- goto fail_close;
+ close(netns);
+ return -1;
}
+ close(netns);
if (unshare(CLONE_NEWNS) < 0) {
fprintf(stderr, "unshare failed: %s\n", strerror(errno));
- goto fail_close;
+ return -1;
}
/* Don't let any mounts propagate back to the parent */
if (mount("", "/", "none", MS_SLAVE | MS_REC, NULL)) {
fprintf(stderr, "\"mount --make-rslave /\" failed: %s\n",
strerror(errno));
- goto fail_close;
+ return -1;
}
/* Mount a version of /sys that describes the network namespace */
if (umount2("/sys", MNT_DETACH) < 0) {
fprintf(stderr, "umount of /sys failed: %s\n", strerror(errno));
- goto fail_close;
+ return -1;
}
if (mount(name, "/sys", "sysfs", 0, NULL) < 0) {
fprintf(stderr, "mount of /sys failed: %s\n",strerror(errno));
- goto fail_close;
+ return -1;
}
/* Setup bind mounts for config files in /etc */
bind_etc(name);
return 0;
-fail_close:
- close(netns);
- return -1;
}
int netns_get_fd(const char *name)
--
2.1.2
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