From aec1e470d906584d755d2b106017995e601abd12 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Fri, 6 Aug 2021 10:03:12 +0200 Subject: [PATCH] ovl: fix uninitialized pointer read in ovl_lookup_real_one() [ Upstream commit 580c610429b3994e8db24418927747cf28443cde ] One error path can result in release_dentry_name_snapshot() being called before "name" was initialized by take_dentry_name_snapshot(). Fix by moving the release_dentry_name_snapshot() to immediately after the only use. Reported-by: Colin Ian King Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/overlayfs/export.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index 11dd8177770d..19574ef17470 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -395,6 +395,7 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected, */ take_dentry_name_snapshot(&name, real); this = lookup_one_len(name.name.name, connected, name.name.len); + release_dentry_name_snapshot(&name); err = PTR_ERR(this); if (IS_ERR(this)) { goto fail; @@ -409,7 +410,6 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected, } out: - release_dentry_name_snapshot(&name); dput(parent); inode_unlock(dir); return this;