From: Chao Yu <chao2.yu@samsung.com>
Date: Wed, 12 Mar 2014 09:08:36 +0000 (+0800)
Subject: f2fs: check upper bound of ino value in f2fs_nfs_get_inode
X-Git-Tag: firefly_0821_release~176^2~4116^2~27
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=910bb12d29cc64144506333bfeaeeee9715c3872;p=firefly-linux-kernel-4.4.55.git

f2fs: check upper bound of ino value in f2fs_nfs_get_inode

Upper bound checking of ino should be added to f2fs_nfs_get_inode, so unneeded
process before do_read_inode in f2fs_iget could be avoided when ino is invalid.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
---

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6e4851ce029b..3a51d7a4a6c9 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -644,6 +644,8 @@ static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 
 	if (unlikely(ino < F2FS_ROOT_INO(sbi)))
 		return ERR_PTR(-ESTALE);
+	if (unlikely(ino >= NM_I(sbi)->max_nid))
+		return ERR_PTR(-ESTALE);
 
 	/*
 	 * f2fs_iget isn't quite right if the inode is currently unallocated!