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Goldwyn Rodrigues 7f7c8c03fe btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref 
[ Upstream commit bc7e097509 ]

btrfs_prelim_ref() calls the old and new reference variables in the
incorrect order. This causes a NULL pointer dereference because oldref
is passed as NULL to trace_btrfs_prelim_ref_insert().

Note, trace_btrfs_prelim_ref_insert() is being called with newref as
oldref (and oldref as NULL) on purpose in order to print out
the values of newref.

To reproduce:
echo 1 > /sys/kernel/debug/tracing/events/btrfs/btrfs_prelim_ref_insert/enable

Perform some writeback operations.

Backtrace:
BUG: kernel NULL pointer dereference, address: 0000000000000018
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 115949067 P4D 115949067 PUD 11594a067 PMD 0
 Oops: Oops: 0000 [#1] SMP NOPTI
 CPU: 1 UID: 0 PID: 1188 Comm: fsstress Not tainted 6.15.0-rc2-tester+ #47 PREEMPT(voluntary)  7ca2cef72d5e9c600f0c7718adb6462de8149622
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014
 RIP: 0010:trace_event_raw_event_btrfs__prelim_ref+0x72/0x130
 Code: e8 43 81 9f ff 48 85 c0 74 78 4d 85 e4 0f 84 8f 00 00 00 49 8b 94 24 c0 06 00 00 48 8b 0a 48 89 48 08 48 8b 52 08 48 89 50 10 <49> 8b 55 18 48 89 50 18 49 8b 55 20 48 89 50 20 41 0f b6 55 28 88
 RSP: 0018:ffffce44820077a0 EFLAGS: 00010286
 RAX: ffff8c6b403f9014 RBX: ffff8c6b55825730 RCX: 304994edf9cf506b
 RDX: d8b11eb7f0fdb699 RSI: ffff8c6b403f9010 RDI: ffff8c6b403f9010
 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000010
 R10: 00000000ffffffff R11: 0000000000000000 R12: ffff8c6b4e8fb000
 R13: 0000000000000000 R14: ffffce44820077a8 R15: ffff8c6b4abd1540
 FS:  00007f4dc6813740(0000) GS:ffff8c6c1d378000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000018 CR3: 000000010eb42000 CR4: 0000000000750ef0
 PKRU: 55555554
 Call Trace:
  <TASK>
  prelim_ref_insert+0x1c1/0x270
  find_parent_nodes+0x12a6/0x1ee0
  ? __entry_text_end+0x101f06/0x101f09
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  btrfs_is_data_extent_shared+0x167/0x640
  ? fiemap_process_hole+0xd0/0x2c0
  extent_fiemap+0xa5c/0xbc0
  ? __entry_text_end+0x101f05/0x101f09
  btrfs_fiemap+0x7e/0xd0
  do_vfs_ioctl+0x425/0x9d0
  __x64_sys_ioctl+0x75/0xc0

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-29 11:03:12 +02:00
..
acpi LoongArch: Fix warnings during S3 suspend 2025-02-08 09:57:59 +01:00
asm-generic mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear() 2025-03-13 13:02:17 +01:00
clocksource x86/hyperv: Fix hv tsc page based sched_clock for hibernation 2024-12-27 14:02:15 +01:00
crypto crypto: ahash - Set default reqsize from ahash_alg 2025-05-29 11:02:40 +02:00
cxl cxl: Move mailbox related bits to the same context 2024-09-12 08:38:01 -07:00
drm drm/atomic: clarify the rules around drm_atomic_state->allow_modeset 2025-05-29 11:03:09 +02:00
dt-bindings dt-bindings: clock: sunxi: Export PLL_VIDEO_2X and PLL_MIPI 2025-02-08 09:57:09 +01:00
keys KEYS: Remove unused declarations 2024-09-20 18:28:26 +03:00
kunit kunit: platform: Resolve 'struct completion' warning 2025-02-21 14:01:25 +01:00
kvm KVM: arm64: Refine PMU defines for number of counters 2024-08-16 13:09:12 +01:00
linux perf: Avoid the read if the count is already updated 2025-05-29 11:03:02 +02:00
math-emu powerpc/math-emu: Remove -w build flag and fix warnings 2022-09-05 17:28:25 +10:00
media media: v4l: Memset argument to 0 before calling get_mbus_config pad op 2025-05-29 11:02:49 +02:00
memory memory: renesas-rpc-if: Remove Runtime PM wrappers 2023-01-23 11:48:00 +01:00
misc cxl: fix typo in comment 2022-11-24 23:12:19 +11:00
net wifi: mac80211: set ieee80211_prep_tx_info::link_id upon Auth Rx 2025-05-29 11:02:56 +02:00
pcmcia ARM: pxa/sa1100: move I/O space to PCI_IOBASE 2022-05-07 22:56:17 +02:00
ras mm/memory-failure: remove obsolete MF_MSG_DIFFERENT_COMPOUND 2024-07-12 15:52:22 -07:00
rdma RDMA/uverbs: Propagate errors from rdma_lookup_get_uobject() 2025-05-29 11:02:19 +02:00
rv rv: Reset per-task monitors also for idle tasks 2025-02-17 10:05:30 +01:00
scsi move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
soc soc: qcom: ice: introduce devm_of_qcom_ice_get 2025-05-02 07:58:52 +02:00
sound ALSA: hda/realtek: Enable PC beep passthrough for HP EliteBook 855 G7 2025-05-29 11:02:32 +02:00
target move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
trace btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref 2025-05-29 11:03:12 +02:00
uapi wifi: cfg80211: allow IR in 20 MHz configurations 2025-05-29 11:02:23 +02:00
ufs scsi: ufs: Introduce quirk to extend PA_HIBERN8TIME for UFS devices 2025-05-29 11:01:58 +02:00
vdso random: vDSO: add a __vdso_getrandom prototype for all architectures 2024-09-13 17:28:35 +02:00
video fbdev: da8xx: remove the driver 2024-10-15 10:08:23 +02:00
xen xen/mcelog: Add __nonstring annotations for unterminated strings 2025-04-20 10:15:12 +02:00