From 2928f0d0c5ebd6c9605c0d98207a44376387c298 Mon Sep 17 00:00:00 2001 From: Adam Thomas Date: Sat, 2 Feb 2013 22:32:31 +0000 Subject: 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 Reviewed-by: Adrian Hunter Cc: stable@vger.kernel.org # v3.6+ Signed-off-by: Artem Bityutskiy --- fs/ubifs/orphan.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/ubifs/orphan.c') 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; -- cgit v1.2.3