[merged] fs-minix-dont-allow-getting-deleted-inodes.patch removed from -mm tree

[merged] fs-minix-dont-allow-getting-deleted-inodes.patch removed from -mm tree

[akpm]

The patch titled
     Subject: fs/minix: don't allow getting deleted inodes
has been removed from the -mm tree.  Its filename was
     fs-minix-dont-allow-getting-deleted-inodes.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Eric Biggers <ebiggers@google.com>
Subject: fs/minix: don't allow getting deleted inodes

If an inode has no links, we need to mark it bad rather than allowing it
to be accessed.  This avoids WARNINGs in inc_nlink() and drop_nlink() when
doing directory operations on a fuzzed filesystem.

Link: http://lkml.kernel.org/r/20200628060846.682158-3-ebiggers@kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: syzbot+a9ac3de1b5de5fb10efc@syzkaller.appspotmail.com
Reported-by: syzbot+df958cf5688a96ad3287@syzkaller.appspotmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Qiujun Huang <anenbupt@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/minix/inode.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/fs/minix/inode.c~fs-minix-dont-allow-getting-deleted-inodes
+++ a/fs/minix/inode.c
@@ -468,6 +468,13 @@ static struct inode *V1_minix_iget(struc
 		iget_failed(inode);
 		return ERR_PTR(-EIO);
 	}
+	if (raw_inode->i_nlinks == 0) {
+		printk("MINIX-fs: deleted inode referenced: %lu\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-ESTALE);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
@@ -501,6 +508,13 @@ static struct inode *V2_minix_iget(struc
 		iget_failed(inode);
 		return ERR_PTR(-EIO);
 	}
+	if (raw_inode->i_nlinks == 0) {
+		printk("MINIX-fs: deleted inode referenced: %lu\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-ESTALE);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
_

Patches currently in -mm which might be from ebiggers@google.com are