Umm ... list_for_each() can't be used in do_master_list_reset() because
the subject entry of the loop is removed for the list within the loop
body. Therefore it can't be used to calculate the next pointer within a
for (...) loop.
There is no list_for_each_safe() macro in the list.h of autofs so it
needs to be done manually.
Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
---
CHANGELOG | 1 +
daemon/automount.c | 8 ++++++--
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/CHANGELOG b/CHANGELOG
index 4faab510..2747327b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
xx/xx/2018 autofs-5.1.5
- fix flag file permission.
- fix directory create permission.
+- fix use after free in do_master_list_reset().
19/12/2017 autofs-5.1.4
- fix spec file url.
diff --git a/daemon/automount.c b/daemon/automount.c
index dcdc19fb..28b3f2f5 100644
--- a/daemon/automount.c
+++ b/daemon/automount.c
@@ -2070,14 +2070,18 @@ static void remove_empty_args(char **argv, int *argc)
static void do_master_list_reset(struct master *master)
{
- struct list_head *head, *p;
+ struct list_head *head, *p, *n;
master_mutex_lock();
head = &master->mounts;
- list_for_each(p, head) {
+ n = head->next;
+ while (n != head) {
struct master_mapent *entry;
+ p = n;
+ n = p->next;
+
entry = list_entry(p, struct master_mapent, list);
if (!list_empty(&entry->list))
--
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