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Jamie Iles 9ce7ac5ed5 jffs2: Fix NULL pointer dereference in rp_size fs option parsing 
[ Upstream commit a61df3c413 ]

syzkaller found the following JFFS2 splat:

  Unable to handle kernel paging request at virtual address dfffa00000000001
  Mem abort info:
    ESR = 0x96000004
    EC = 0x25: DABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
  Data abort info:
    ISV = 0, ISS = 0x00000004
    CM = 0, WnR = 0
  [dfffa00000000001] address between user and kernel address ranges
  Internal error: Oops: 96000004 [#1] SMP
  Dumping ftrace buffer:
     (ftrace buffer empty)
  Modules linked in:
  CPU: 0 PID: 12745 Comm: syz-executor.5 Tainted: G S                5.9.0-rc8+ #98
  Hardware name: linux,dummy-virt (DT)
  pstate: 20400005 (nzCv daif +PAN -UAO BTYPE=--)
  pc : jffs2_parse_param+0x138/0x308 fs/jffs2/super.c:206
  lr : jffs2_parse_param+0x108/0x308 fs/jffs2/super.c:205
  sp : ffff000022a57910
  x29: ffff000022a57910 x28: 0000000000000000
  x27: ffff000057634008 x26: 000000000000d800
  x25: 000000000000d800 x24: ffff0000271a9000
  x23: ffffa0001adb5dc0 x22: ffff000023fdcf00
  x21: 1fffe0000454af2c x20: ffff000024cc9400
  x19: 0000000000000000 x18: 0000000000000000
  x17: 0000000000000000 x16: ffffa000102dbdd0
  x15: 0000000000000000 x14: ffffa000109e44bc
  x13: ffffa00010a3a26c x12: ffff80000476e0b3
  x11: 1fffe0000476e0b2 x10: ffff80000476e0b2
  x9 : ffffa00010a3ad60 x8 : ffff000023b70593
  x7 : 0000000000000003 x6 : 00000000f1f1f1f1
  x5 : ffff000023fdcf00 x4 : 0000000000000002
  x3 : ffffa00010000000 x2 : 0000000000000001
  x1 : dfffa00000000000 x0 : 0000000000000008
  Call trace:
   jffs2_parse_param+0x138/0x308 fs/jffs2/super.c:206
   vfs_parse_fs_param+0x234/0x4e8 fs/fs_context.c:117
   vfs_parse_fs_string+0xe8/0x148 fs/fs_context.c:161
   generic_parse_monolithic+0x17c/0x208 fs/fs_context.c:201
   parse_monolithic_mount_data+0x7c/0xa8 fs/fs_context.c:649
   do_new_mount fs/namespace.c:2871 [inline]
   path_mount+0x548/0x1da8 fs/namespace.c:3192
   do_mount+0x124/0x138 fs/namespace.c:3205
   __do_sys_mount fs/namespace.c:3413 [inline]
   __se_sys_mount fs/namespace.c:3390 [inline]
   __arm64_sys_mount+0x164/0x238 fs/namespace.c:3390
   __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]
   invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]
   el0_svc_common.constprop.0+0x15c/0x598 arch/arm64/kernel/syscall.c:149
   do_el0_svc+0x60/0x150 arch/arm64/kernel/syscall.c:195
   el0_svc+0x34/0xb0 arch/arm64/kernel/entry-common.c:226
   el0_sync_handler+0xc8/0x5b4 arch/arm64/kernel/entry-common.c:236
   el0_sync+0x15c/0x180 arch/arm64/kernel/entry.S:663
  Code: d2d40001 f2fbffe1 91002260 d343fc02 (38e16841)
  ---[ end trace 4edf690313deda44 ]---

This is because since ec10a24f10, the option parsing happens before
fill_super and so the MTD device isn't associated with the filesystem.
Defer the size check until there is a valid association.

Fixes: ec10a24f10 ("vfs: Convert jffs2 to use the new mount API")
Cc: <stable@vger.kernel.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Jamie Iles <jamie@nuviainc.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-01-06 14:48:37 +01:00
Documentation x86/CPU/AMD: Save AMD NodeId as cpu_die_id 2020-12-30 11:51:47 +01:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch powerpc/bitops: Fix possible undefined behaviour with fls() and fls64() 2021-01-06 14:48:36 +01:00
block blk-mq: In blk_mq_dispatch_rq_list() "no budget" is a reason to kick 2020-12-30 11:50:54 +01:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto crypto: ecdh - avoid unaligned accesses in ecdh_set_secret() 2020-12-30 11:51:35 +01:00
drivers vfio/pci: Move dummy_resources_list init in vfio_pci_probe() 2021-01-06 14:48:36 +01:00
fs jffs2: Fix NULL pointer dereference in rp_size fs option parsing 2021-01-06 14:48:37 +01:00
include fscrypt: remove kernel-internal constants from UAPI header 2021-01-06 14:48:35 +01:00
init initramfs: fix clang build failure 2020-12-30 11:51:30 +01:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS" 2020-12-30 11:51:47 +01:00
lib lib/syscall: fix syscall registers retrieval on 32-bit platforms 2020-12-11 13:23:32 +01:00
mm mm: don't wake kswapd prematurely when watermark boosting is disabled 2020-12-30 11:51:27 +01:00
net net/sched: sch_taprio: reset child qdiscs before freeing them 2021-01-06 14:48:35 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-30 11:51:12 +01:00
scripts kconfig: fix return value of do_error_if() 2020-12-30 11:51:29 +01:00
security ima: Don't modify file descriptor mode on the fly 2020-12-30 11:51:39 +01:00
sound ASoC: cx2072x: Fix doubly definitions of Playback and Capture streams 2020-12-30 11:51:35 +01:00
tools perf probe: Fix memory leak when synthesizing SDT probes 2020-12-30 11:51:29 +01:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace 2020-12-02 08:49:46 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-08-26 10:40:46 +02:00
Makefile Linux 5.4.86 2020-12-30 11:51:48 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.