fs/ntfs3: Fix oob in ntfs_listxattr

[ Upstream commit 731ab1f9828800df871c5a7ab9ffe965317d3f15 ]

The length of name cannot exceed the space occupied by ea.

Reported-and-tested-by: syzbot+65e940cfb8f99a97aca7@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 838a79157fb9929e31bc3a279a5fffcbc1f759b2..b50010494e6d061e4af6e8316866e2cb4acbf678 100644 (file)
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -219,6 +219,9 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
                if (!ea->name_len)
                        break;
 
+               if (ea->name_len > ea_size)
+                       break;
+
                if (buffer) {
                        /* Check if we can use field ea->name */
                        if (off + ea_size > size)