Subject: CVE-2023-52896: btrfs: fix race between quota rescan and disable leading to NULL pointer deref

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix race between quota rescan and disable leading to NULL pointer deref

If we have one task trying to start the quota rescan worker while another
one is trying to disable quotas, we can end up hitting a race that results
in the quota rescan worker doing a NULL pointer dereference. The steps for
this are the following:

1) Quotas are enabled;

2) Task A calls the quota rescan ioctl and enters btrfs_qgroup_rescan().
   It calls qgroup_rescan_init() which returns 0 (success) and then joins a
   transaction and commits it;

3) Task B calls the quota disable ioctl and enters btrfs_quota_disable().
   It clears the bit BTRFS_FS_QUOTA_ENABLED from fs_info->flags and calls
   btrfs_qgroup_wait_for_completion(), which returns immediately since the
   rescan worker is not yet running.
   Then it starts a transaction and locks fs_info->qgroup_ioctl_lock;

4) Task A queues the rescan worker, by calling btrfs_queue_work();

5) The rescan worker starts, and calls rescan_should_stop() at the start
   of its while loop, which results in 0 iterations of the loop, since
   the flag BTRFS_FS_QUOTA_ENABLED was cleared from fs_info->flags by
   task B at step 3);

6) Task B sets fs_info->quota_root to NULL;

7) The rescan worker tries to start a transaction and uses
   fs_info->quota_root as the root argument for btrfs_start_transaction().
   This results in a NULL pointer dereference down the call chain of
   btrfs_start_transaction(). The stack trace is something like the one
   reported in Link tag below:

   general protection fault, probably for non-canonical address 0xdffffc0000000041: 0000 [#1] PREEMPT SMP KASAN
   KASAN: null-ptr-deref in range [0x0000000000000208-0x000000000000020f]
   CPU: 1 PID: 34 Comm: kworker/u4:2 Not tainted 6.1.0-syzkaller-13872-gb6bb9676f216 #0
   Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
   Workqueue: btrfs-qgroup-rescan btrfs_work_helper
   RIP: 0010:start_transaction+0x48/0x10f0 fs/btrfs/transaction.c:564
   Code: 48 89 fb 48 (...)
   RSP: 0018:ffffc90000ab7ab0 EFLAGS: 00010206
   RAX: 0000000000000041 RBX: 0000000000000208 RCX: ffff88801779ba80
   RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
   RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff52000156f5d
   R10: fffff52000156f5d R11: 1ffff92000156f5c R12: 0000000000000000
   R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
   FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: 00007f2bea75b718 CR3: 000000001d0cc000 CR4: 00000000003506e0
   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   Call Trace:
    <TASK>
    btrfs_qgroup_rescan_worker+0x3bb/0x6a0 fs/btrfs/qgroup.c:3402
    btrfs_work_helper+0x312/0x850 fs/btrfs/async-thread.c:280
    process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
    worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
    kthread+0x266/0x300 kernel/kthread.c:376
    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
    </TASK>
   Modules linked in:

So fix this by having the rescan worker function not attempt to start a
transaction if it didn't do any rescan work.

The Linux kernel CVE team has assigned CVE-2023-52896 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 5.4.178 with commit 26b3901d20bf and fixed in 5.4.230 with commit 89ac597e3e80
	Issue introduced in 5.10.99 with commit 32747e01436a and fixed in 5.10.165 with commit 3bd433748571
	Issue introduced in 5.15.22 with commit 89d4cca583fc and fixed in 5.15.90 with commit 64287cd456a2
	Issue introduced in 5.17 with commit e804861bd4e6 and fixed in 6.1.8 with commit 1004fc90f0d7
	Issue introduced in 5.17 with commit e804861bd4e6 and fixed in 6.2 with commit b7adbf9ada35
	Issue introduced in 5.16.8 with commit 31198e58c09e

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2023-52896
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	fs/btrfs/qgroup.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/89ac597e3e807b91e2ebd6a7c36fec7b97290233
	https://git.kernel.org/stable/c/3bd43374857103ba3cac751d6d4afa8d83b5d92a
	https://git.kernel.org/stable/c/64287cd456a22373053998c1fccf14b651e9cbbd
	https://git.kernel.org/stable/c/1004fc90f0d79a4b7d9e3d432729914f472f9ad1
	https://git.kernel.org/stable/c/b7adbf9ada3513d2092362c8eac5cddc5b651f5c