lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 25 Mar 2024 10:08:02 +0100
From: Greg Kroah-Hartman <>
Cc: Greg Kroah-Hartman <>
Subject: CVE-2021-47145: btrfs: do not BUG_ON in link_to_fixup_dir


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

btrfs: do not BUG_ON in link_to_fixup_dir

While doing error injection testing I got the following panic

  kernel BUG at fs/btrfs/tree-log.c:1862!
  invalid opcode: 0000 [#1] SMP NOPTI
  CPU: 1 PID: 7836 Comm: mount Not tainted 5.13.0-rc1+ #305
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
  RIP: 0010:link_to_fixup_dir+0xd5/0xe0
  RSP: 0018:ffffb5800180fa30 EFLAGS: 00010216
  RAX: fffffffffffffffb RBX: 00000000fffffffb RCX: ffff8f595287faf0
  RDX: ffffb5800180fa37 RSI: ffff8f5954978800 RDI: 0000000000000000
  RBP: ffff8f5953af9450 R08: 0000000000000019 R09: 0000000000000001
  R10: 000151f408682970 R11: 0000000120021001 R12: ffff8f5954978800
  R13: ffff8f595287faf0 R14: ffff8f5953c77dd0 R15: 0000000000000065
  FS:  00007fc5284c8c40(0000) GS:ffff8f59bbd00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007fc5287f47c0 CR3: 000000011275e002 CR4: 0000000000370ee0
  Call Trace:
   ? btree_read_extent_buffer_pages+0xd0/0x110
   ? replay_one_extent+0x7b0/0x7b0
   ? __kmalloc_track_caller+0x12f/0x240
   ? vfs_parse_fs_string+0x4d/0x90

We can get -EIO or any number of legitimate errors from
btrfs_search_slot(), panicing here is not the appropriate response.  The
error path for this code handles errors properly, simply return the

The Linux kernel CVE team has assigned CVE-2021-47145 to this issue.

Affected and fixed versions

	Fixed in 4.4.271 with commit 76bfd8ac20be
	Fixed in 4.9.271 with commit e934c4ee17b3
	Fixed in 4.14.235 with commit 0eaf383c6a4a
	Fixed in 4.19.193 with commit 6eccfb28f8dc
	Fixed in 5.4.124 with commit 0ed102453aa1
	Fixed in 5.10.42 with commit 7e13db503918
	Fixed in 5.12.9 with commit b54544213358
	Fixed in 5.13 with commit 91df99a6eb50

Please see 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
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:


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:

Powered by blists - more mailing lists