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authorAdam Thomas <adamthomas1111@gmail.com>2013-02-02 22:35:08 +0000
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2013-02-04 12:31:48 +0200
commit8afd500cb52a5d00bab4525dd5a560d199f979b9 (patch)
tree91ee2f6917c1f84300308dc6e659865cae89a3cc /fs/ubifs/orphan.c
parent2928f0d0c5ebd6c9605c0d98207a44376387c298 (diff)
UBIFS: fix double free of ubifs_orphan objects
The last orphan in the dnext list has its dnext set to NULL. Because of that, ubifs_delete_orphan assumes that it is not on the dnext list and frees it immediately instead ignoring it as a second delete. The orphan is later freed again by erase_deleted. This change adds an explicit flag to ubifs_orphan indicating whether it is pending delete. Signed-off-by: Adam Thomas <adamthomas1111@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ubifs/orphan.c')
-rw-r--r--fs/ubifs/orphan.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 8534d9c6492..ba32da3fe08 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -126,13 +126,14 @@ void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum)
else if (inum > o->inum)
p = p->rb_right;
else {
- if (o->dnext) {
+ if (o->del) {
spin_unlock(&c->orphan_lock);
dbg_gen("deleted twice ino %lu",
(unsigned long)inum);
return;
}
if (o->cmt) {
+ o->del = 1;
o->dnext = c->orph_dnext;
c->orph_dnext = o;
spin_unlock(&c->orphan_lock);
@@ -447,6 +448,7 @@ static void erase_deleted(struct ubifs_info *c)
orphan = dnext;
dnext = orphan->dnext;
ubifs_assert(!orphan->new);
+ ubifs_assert(orphan->del);
rb_erase(&orphan->rb, &c->orph_tree);
list_del(&orphan->list);
c->tot_orphans -= 1;
@@ -536,6 +538,7 @@ static int insert_dead_orphan(struct ubifs_info *c, ino_t inum)
rb_link_node(&orphan->rb, parent, p);
rb_insert_color(&orphan->rb, &c->orph_tree);
list_add_tail(&orphan->list, &c->orph_list);
+ orphan->del = 1;
orphan->dnext = c->orph_dnext;
c->orph_dnext = orphan;
dbg_mnt("ino %lu, new %d, tot %d", (unsigned long)inum,