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From 0881ff2b6842798836faef3a55a04a3e6e0cbb66 Mon Sep 17 00:00:00 2001
From: Michal Schmidt <mschmidt@redhat.com>
Date: Mon, 16 Mar 2015 22:04:21 +0100
Subject: [PATCH] core/namespace: fix path sorting
The comparison function we use for qsorting paths is overly indifferent.
Consider these 3 paths for sorting:
/foo
/bar
/foo/foo
qsort() may compare:
"/foo" with "/bar" => 0, indifference
"/bar" with "/foo/foo" => 0, indifference
and assume transitively that "/foo" and "/foo/foo" are also indifferent.
But this is wrong, we want "/foo" sorted before "/foo/foo".
The comparison function must be transitive.
Use path_compare(), which behaves properly.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1184016
(cherry picked from commit a0827e2b123010c46cfe4f03eebba57d92f9efc4)
---
src/core/namespace.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/src/core/namespace.c b/src/core/namespace.c
index 4fecd3236..d4f1c8621 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -91,9 +91,11 @@ static int append_mounts(BindMount **p, char **strv, MountMode mode) {
static int mount_path_compare(const void *a, const void *b) {
const BindMount *p = a, *q = b;
+ int d;
- if (path_equal(p->path, q->path)) {
+ d = path_compare(p->path, q->path);
+ if (!d) {
/* If the paths are equal, check the mode */
if (p->mode < q->mode)
return -1;
@@ -105,13 +107,7 @@ static int mount_path_compare(const void *a, const void *b) {
}
/* If the paths are not equal, then order prefixes first */
- if (path_startswith(p->path, q->path))
- return 1;
-
- if (path_startswith(q->path, p->path))
- return -1;
-
- return 0;
+ return d;
}
static void drop_duplicates(BindMount *m, unsigned *n) {