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authorAdam Thomas <adamthomas1111@gmail.com>2013-02-02 22:32:31 +0000
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2013-02-04 12:31:00 +0200
commit2928f0d0c5ebd6c9605c0d98207a44376387c298 (patch)
treee15d676a7c9f493853c0fbbab1ed2e71cf5fc0c6
parent3d251a5b9e2f09edcf25bbffe1fa308d0f648bf1 (diff)
downloadlinux-2928f0d0c5ebd6c9605c0d98207a44376387c298.tar.bz2
UBIFS: fix use of freed ubifs_orphan objects
The last orphan in the cnext list has its cnext set to NULL. Because of that, ubifs_delete_orphan assumes that it is not on the cnext list and frees it immediately instead of adding it to the dnext list. The freed orphan is later modified by write_orph_node. This can cause various inconsistencies including directory entries that cannot be removed and this error: UBIFS error (pid 20685): layout_cnodes: LPT out of space at LEB 14:129009 needing 17, done_ltab 1, done_lsave 1 This is a regression introduced by "7074e5eb UBIFS: remove invalid reference to list iterator variable". This change adds an explicit flag to ubifs_orphan indicating whether it is pending commit. Signed-off-by: Adam Thomas <adamthomas1111@gmail.com> Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> Cc: stable@vger.kernel.org # v3.6+ Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
-rw-r--r--fs/ubifs/orphan.c7
-rw-r--r--fs/ubifs/ubifs.h4
2 files changed, 9 insertions, 2 deletions
diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 769701ccb5c9..8534d9c6492f 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -132,7 +132,7 @@ void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum)
(unsigned long)inum);
return;
}
- if (o->cnext) {
+ if (o->cmt) {
o->dnext = c->orph_dnext;
c->orph_dnext = o;
spin_unlock(&c->orphan_lock);
@@ -172,7 +172,9 @@ int ubifs_orphan_start_commit(struct ubifs_info *c)
last = &c->orph_cnext;
list_for_each_entry(orphan, &c->orph_new, new_list) {
ubifs_assert(orphan->new);
+ ubifs_assert(!orphan->cmt);
orphan->new = 0;
+ orphan->cmt = 1;
*last = orphan;
last = &orphan->cnext;
}
@@ -299,7 +301,9 @@ static int write_orph_node(struct ubifs_info *c, int atomic)
cnext = c->orph_cnext;
for (i = 0; i < cnt; i++) {
orphan = cnext;
+ ubifs_assert(orphan->cmt);
orph->inos[i] = cpu_to_le64(orphan->inum);
+ orphan->cmt = 0;
cnext = orphan->cnext;
orphan->cnext = NULL;
}
@@ -378,6 +382,7 @@ static int consolidate(struct ubifs_info *c)
list_for_each_entry(orphan, &c->orph_list, list) {
if (orphan->new)
continue;
+ orphan->cmt = 1;
*last = orphan;
last = &orphan->cnext;
cnt += 1;
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index d133c276fe05..c16fff7271d3 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -904,6 +904,7 @@ struct ubifs_budget_req {
* @dnext: next orphan to delete
* @inum: inode number
* @new: %1 => added since the last commit, otherwise %0
+ * @cmt: %1 => commit pending, otherwise %0
*/
struct ubifs_orphan {
struct rb_node rb;
@@ -912,7 +913,8 @@ struct ubifs_orphan {
struct ubifs_orphan *cnext;
struct ubifs_orphan *dnext;
ino_t inum;
- int new;
+ unsigned new:1;
+ unsigned cmt:1;
};
/**