* [PATCH AUTOSEL 5.4 5/5] ovl: fix uninitialized pointer read in ovl_lookup_real_one()
[not found] <20210817003607.83340-1-sashal@kernel.org>
@ 2021-08-17 0:36 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-08-17 0:36 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Miklos Szeredi, Colin Ian King, Sasha Levin, linux-unionfs
From: Miklos Szeredi <mszeredi@redhat.com>
[ 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 <colin.king@canonical.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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;
--
2.30.2
^ permalink raw reply related [flat|nested] only message in thread