FAILED: patch "[PATCH] nilfs2: fix use-after-free bug of struct nilfs_root" failed to apply to 4.9-stable tree - Linux-stable-mirror

12 Oct 2022

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to stable@vger.kernel.org.
Possible dependencies:
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<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit </a> (<a href='https://git-scm.com/'>git 2.34.1</a>) at 2022-10-12 20:34:18 +0000</div>
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thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d325dc6eb763c10f591c239550b8c7e5466a5d09 Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi konishi.ryusuke@gmail.com
Date: Tue, 4 Oct 2022 00:05:19 +0900
Subject: [PATCH] nilfs2: fix use-after-free bug of struct nilfs_root
If the beginning of the inode bitmap area is corrupted on disk, an inode
with the same inode number as the root inode can be allocated and fail
soon after.  In this case, the subsequent call to nilfs_clear_inode() on
that bogus root inode will wrongly decrement the reference counter of
struct nilfs_root, and this will erroneously free struct nilfs_root,
causing kernel oopses.
This fixes the problem by changing nilfs_new_inode() to skip reserved
inode numbers while repairing the inode bitmap.
Link: https://lkml.kernel.org/r/20221003150519.39789-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi konishi.ryusuke@gmail.com
Reported-by: syzbot+b8c672b0e22615c80fe0@syzkaller.appspotmail.com
Reported-by: Khalid Masum khalid.masum.92@gmail.com
Tested-by: Ryusuke Konishi konishi.ryusuke@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Morton akpm@linux-foundation.org

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 67f63cfeade5..b074144f6f83 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -328,6 +328,7 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
    struct inode *inode;
    struct nilfs_inode_info *ii;
    struct nilfs_root *root;
+	struct buffer_head *bh;
    int err = -ENOMEM;
    ino_t ino;
@@ -343,11 +344,25 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
    ii->i_state = BIT(NILFS_I_NEW);
    ii->i_root = root;
-	err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
+	err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
    if (unlikely(err))
    	goto failed_ifile_create_inode;
    /* reference count of i_bh inherits from nilfs_mdt_read_block() */
+	if (unlikely(ino < NILFS_USER_INO)) {
+		nilfs_warn(sb,
+			   "inode bitmap is inconsistent for reserved inodes");
+		do {
+			brelse(bh);
+			err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
+			if (unlikely(err))
+				goto failed_ifile_create_inode;
+		} while (ino < NILFS_USER_INO);
+
+		nilfs_info(sb, "repaired inode bitmap for reserved inodes");
+	}
+	ii->i_bh = bh;
+
    atomic64_inc(&root->inodes_count);
    inode_init_owner(&init_user_ns, inode, dir, mode);
    inode->i_ino = ino;

    