ocfs2_qinfo_lock_res_init is called too early while oinfo->dqi_gi.dqi_sb is still a NULL pointer causing a crash on mount when quotas are enabled. Restore ocfs2_qinfo_lock_res_init original call location in ocfs2_global_read_info after the value of oinfo->dqi_gi.dqi_sb is set.

[ 389.111864] ocfs2: Mounting device (254,16) on (node 2, slot 0) with ordered data mode. [ 389.160182] BUG: kernel NULL pointer dereference, address: 0000000000000398 [ 389.160295] #PF: supervisor read access in kernel mode [ 389.160343] #PF: error_code(0x0000) - not-present page [ 389.160390] PGD 0 P4D 0 [ 389.160432] Oops: 0000 [#1] PREEMPT SMP PTI [ 389.160477] CPU: 0 PID: 836 Comm: mount.ocfs2 Not tainted 5.16.0-4-amd64 #1 Debian 5.16.12-1 [ 389.160591] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 [ 389.160714] RIP: 0010:ocfs2_qinfo_lock_res_init+0x44/0x50 [ocfs2] [ 389.161290] Code: 00 00 00 48 63 b3 b8 01 00 00 e8 87 bb ff ff 49 89 d8 48 89 ee ba 08 00 00 00 48 8b 83 b0 01 00 00 48 c7 c1 a0 e0 dc c0 5b 5d <48> 8b b8 98 03 00 00 e9 70 c4 ff ff 0f 1f 44 00 00 41 56 41 89 ce [ 389.161460] RSP: 0018:ffffb2c0c0047be8 EFLAGS: 00010282 [ 389.161510] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffc0dce0a0 [ 389.161619] RDX: 0000000000000008 RSI: ffff8b685c343c30 RDI: ffffb2c0c0047bb8 [ 389.161747] RBP: ffff8b685c343c00 R08: ffff8b685c343c00 R09: 0000000000000000 [ 389.161809] R10: ffffb2c0c0047bb0 R11: ffffffffc0d8f030 R12: ffff8b685c343c18 [ 389.161868] R13: ffff8b68462d3ec8 R14: 0000000000000000 R15: ffff8b6848fb6800 [ 389.161929] FS: 00007f7956901c00(0000) GS:ffff8b687ec00000(0000) knlGS:0000000000000000 [ 389.162009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 389.162060] CR2: 0000000000000398 CR3: 000000000554a004 CR4: 0000000000370ef0 [ 389.162129] Call Trace: [ 389.162184] <TASK> [ 389.162211] ocfs2_local_read_info+0xb9/0x6f0 [ocfs2] [ 389.162479] ? ocfs2_local_check_quota_file+0x197/0x390 [ocfs2] [ 389.162774] dquot_load_quota_sb+0x216/0x470 [ 389.162849] ? preempt_count_add+0x68/0xa0 [ 389.162895] dquot_load_quota_inode+0x85/0x100 [ 389.162943] ocfs2_enable_quotas+0xa0/0x1c0 [ocfs2] [ 389.163151] ocfs2_fill_super.cold+0xc8/0x1bf [ocfs2] [ 389.163374] mount_bdev+0x185/0x1b0 [ 389.163431] ? ocfs2_initialize_super.isra.0+0xf40/0xf40 [ocfs2] [ 389.163673] legacy_get_tree+0x27/0x40 [ 389.163726] vfs_get_tree+0x25/0xb0 [ 389.163764] path_mount+0x465/0xac0 [ 389.163804] __x64_sys_mount+0x103/0x140 [ 389.163844] do_syscall_64+0x3b/0xc0 [ 389.163919] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 389.164016] RIP: 0033:0x7f7956e0258a [ 389.164057] Code: 48 8b 0d e9 28 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b6 28 0d 00 f7 d8 64 89 01 48 [ 389.164206] RSP: 002b:00007fff9be78718 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 389.164273] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7956e0258a [ 389.164334] RDX: 000055bffbe230ae RSI: 000055bffc7ec370 RDI: 000055bffc7f33f0 [ 389.164395] RBP: 00007fff9be788d0 R08: 000055bffc7f3390 R09: 00007fff9be76110 [ 389.164454] R10: 0000000000000000 R11: 0000000000000246 R12: 000055bffbe230ae [ 389.164514] R13: 000055bffc7ec301 R14: 00007fff9be787c0 R15: 00007fff9be78740 [ 389.166469] </TASK> [ 389.168355] Modules linked in: ocfs2 quota_tree ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue sctp ip6_udp_tunnel udp_tunnel libcrc32c intel_rapl_msr intel_rapl_common intel_pmc_core_pltdrv intel_pmc_core kvm_intel kvm irqbypass ghash_clmulni_intel snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi aesni_intel crypto_simd qxl snd_hda_codec cryptd drm_ttm_helper rapl snd_hda_core ttm snd_hwdep snd_pcm serio_raw snd_timer iTCO_wdt pcspkr intel_pmc_bxt iTCO_vendor_support drm_kms_helper snd virtio_rng rng_core soundcore virtio_balloon virtio_console cec evdev joydev i6300esb rc_core watchdog qemu_fw_cfg button auth_rpcgss sunrpc drm fuse configfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic hid_generic usbhid hid virtio_net net_failover failover virtio_blk ahci xhci_pci libahci libata xhci_hcd crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel virtio_pci virtio_pci_legacy_dev virtio_pci_modern _dev [ 389.168645] virtio psmouse usbcore scsi_mod i2c_i801 i2c_smbus scsi_common lpc_ich usb_common virtio_ring [ 389.187016] CR2: 0000000000000398 [ 389.188963] ---[ end trace 571e3ca036b59855 ]---

Fixes: 6c85c2c72819 ("ocfs2: quota_local: fix possible uninitialized-variable access in ocfs2_local_read_info()") Reported-by: Dayvison sathlerds@gmail.com Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1007141 Cc: stable@vger.kernel.org Signed-off-by: Valentin Vidic vvidic@valentin-vidic.from.hr --- fs/ocfs2/quota_global.c | 1 + fs/ocfs2/quota_local.c | 1 - 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c index f033de733adb..eda83487c9ec 100644 --- a/fs/ocfs2/quota_global.c +++ b/fs/ocfs2/quota_global.c @@ -357,6 +357,7 @@ int ocfs2_global_read_info(struct super_block *sb, int type) } oinfo->dqi_gi.dqi_sb = sb; oinfo->dqi_gi.dqi_type = type; + ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; oinfo->dqi_gqi_bh = NULL; diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c index 0e4b16d4c037..e6037e4a1641 100644 --- a/fs/ocfs2/quota_local.c +++ b/fs/ocfs2/quota_local.c @@ -703,7 +703,6 @@ static int ocfs2_local_read_info(struct super_block *sb, int type) oinfo->dqi_type = type; INIT_LIST_HEAD(&oinfo->dqi_chunk); oinfo->dqi_gqinode = NULL; - ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); oinfo->dqi_rec = NULL; oinfo->dqi_lqi_bh = NULL; oinfo->dqi_libh = NULL;