From 2159184ea01e4ae7d15f2017e296d4bc82d5aeb0 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 28 May 2015 23:09:19 -0400 Subject: [PATCH] d_walk() might skip too much when we find that a child has died while we'd been trying to ascend, we should go into the first live sibling itself, rather than its sibling. Off-by-one in question had been introduced in "deal with deadlock in d_walk()" and the fix needs to be backported to all branches this one has been backported to. Cc: stable@vger.kernel.org # 3.2 and later Signed-off-by: Al Viro --- fs/dcache.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/dcache.c b/fs/dcache.c index 656ce522a218..37b5afdaf698 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1239,13 +1239,13 @@ ascend: /* might go back up the wrong parent if we have had a rename. */ if (need_seqretry(&rename_lock, seq)) goto rename_retry; - next = child->d_child.next; - while (unlikely(child->d_flags & DCACHE_DENTRY_KILLED)) { + /* go into the first sibling still alive */ + do { + next = child->d_child.next; if (next == &this_parent->d_subdirs) goto ascend; child = list_entry(next, struct dentry, d_child); - next = next->next; - } + } while (unlikely(child->d_flags & DCACHE_DENTRY_KILLED)); rcu_read_unlock(); goto resume; } -- 2.20.1