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autofs-5.1.4 - fix use after free in do_master_list_reset()
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From: Ian Kent <raven@themaw.net>
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Umm ... list_for_each() can't be used in do_master_list_reset() because
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the subject entry of the loop is removed for the list within the loop
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body. Therefore it can't be used to calculate the next pointer within a
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for (...) loop.
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There is no list_for_each_safe() macro in the list.h of autofs so it
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needs to be done manually.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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daemon/automount.c | 8 ++++++--
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2 files changed, 7 insertions(+), 2 deletions(-)
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diff --git a/CHANGELOG b/CHANGELOG
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index 4cb23f2..6cd3029 100644
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--- a/CHANGELOG
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+++ b/CHANGELOG
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@@ -289,6 +289,7 @@
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- fix open calls not using open_xxxx() calls.
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- move open_xxxx() functions to spawn.c.
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- serialize calls to open_xxxx() functions.
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+- fix use after free in do_master_list_reset().
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25/07/2012 autofs-5.0.7
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=======================
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diff --git a/daemon/automount.c b/daemon/automount.c
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index d96cd35..1a61b90 100644
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--- a/daemon/automount.c
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+++ b/daemon/automount.c
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@@ -2075,14 +2075,18 @@ static void remove_empty_args(char **argv, int *argc)
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static void do_master_list_reset(struct master *master)
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{
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- struct list_head *head, *p;
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+ struct list_head *head, *p, *n;
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master_mutex_lock();
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head = &master->mounts;
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- list_for_each(p, head) {
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+ n = head->next;
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+ while (n != head) {
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struct master_mapent *entry;
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+ p = n;
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+ n = p->next;
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+
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entry = list_entry(p, struct master_mapent, list);
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if (!list_empty(&entry->list))
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