https://bugzilla.kernel.org/show_bug.cgi?id=216539 Bug ID: 216539 Summary: FUZZ: general protection fault, KASAN: null-ptr-deref at fs/ext4/ext4.h:ext4_free_blocks() when mount a corrupted image Product: File System Version: 2.5 Kernel Version: 5.15.71, 6.0-rc7 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: fs_ext4@xxxxxxxxxxxxxxxxxxxx Reporter: wenqingliu0120@xxxxxxxxx Regression: No Created attachment 301890 --> https://bugzilla.kernel.org/attachment.cgi?id=301890&action=edit corrupted image and .config - Overview FUZZ: general protection fault, KASAN: null-ptr-deref at fs/ext4/ext4.h:ext4_free_blocks() when mount a corrupted image - Reproduce Tested on kernel 5.15.71, 6.0-rc7 # mkdir mnt # mount tmp19.img mnt -Kernel dump [ 487.033334] loop5: detected capacity change from 0 to 32768 [ 487.064295] EXT4-fs (loop5): warning: mounting unchecked fs, running e2fsck is recommended [ 487.067570] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 487.067697] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 487.067753] CPU: 1 PID: 1099 Comm: mount Not tainted 6.0.0-rc7 #1 [ 487.067802] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [ 487.067858] RIP: 0010:ext4_free_blocks+0x7c1/0x1e30 [ 487.067907] Code: 49 8d bf b8 02 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 42 11 00 00 49 8b 87 b8 02 00 00 4e 8d 24 e0 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 30 11 00 00 4d 8b 24 24 e8 4c df 71 ff 4f 8d 24 [ 487.068031] RSP: 0018:ffffc9000085f3c0 EFLAGS: 00010246 [ 487.068075] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000005 [ 487.068125] RDX: 0000000000000000 RSI: 0000000000001c06 RDI: ffff8881260a82b8 [ 487.068175] RBP: ffff88812a6c8000 R08: 00000000000000fe R09: 0000000000000030 [ 487.068226] R10: ffff8881260a8000 R11: 00000000000000fe R12: 0000000000000000 [ 487.068276] R13: ffff888108f9fec8 R14: 0000000000000001 R15: ffff8881260a8000 [ 487.068326] FS: 00007f6c2fd0c840(0000) GS:ffff888293680000(0000) knlGS:0000000000000000 [ 487.068382] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 487.068439] CR2: 00007f9e763a6400 CR3: 00000001058e6006 CR4: 0000000000370ee0 [ 487.068493] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 487.068542] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 487.068596] Call Trace: [ 487.068617] <TASK> [ 487.068637] ? ext4_mb_new_blocks+0x4030/0x4030 [ 487.068677] ? ext4_sb_block_valid+0x257/0x380 [ 487.068712] ? __ext4_ext_check+0x689/0x13c0 [ 487.068746] ext4_ext_remove_space+0x12d2/0x3b40 [ 487.068785] ? _raw_write_lock+0x87/0xe0 [ 487.068816] ? ext4_ext_index_trans_blocks+0x100/0x100 [ 487.068855] ? _raw_write_unlock+0x39/0x70 [ 487.068886] ? ext4_es_remove_extent+0x170/0x260 [ 487.068922] ? ext4_es_lookup_extent+0x960/0x960 [ 487.068957] ? down_write+0xad/0x120 [ 487.068987] ext4_ext_truncate+0x261/0x300 [ 487.069020] ext4_truncate+0x9f8/0xef0 [ 487.069049] ? ext4_punch_hole+0x1030/0x1030 [ 487.069082] ? __ext4_journal_start_sb+0x23f/0x2d0 [ 487.069119] ext4_evict_inode+0x7e6/0x14e0 [ 487.069151] ? complete_all+0xc0/0xc0 [ 487.069182] ? ext4_da_write_begin+0x6b0/0x6b0 [ 487.069215] ? _raw_spin_lock_irqsave+0xf0/0xf0 [ 487.069249] ? _raw_spin_lock_irqsave+0xf0/0xf0 [ 487.069284] evict+0x284/0x4e0 [ 487.069310] ext4_setup_system_zone+0x66c/0x840 [ 487.069345] ? preempt_schedule_common+0x5e/0xd0 [ 487.069381] ? ext4_exit_system_zone+0x20/0x20 [ 487.069416] ? ext4_setup_super+0x3b7/0x8e0 [ 487.070661] ? _raw_spin_unlock+0x15/0x30 [ 487.071887] ext4_fill_super+0x999c/0xea10 [ 487.073131] ? ext4_reconfigure+0x2250/0x2250 [ 487.074317] ? down_write+0xad/0x120 [ 487.075454] ? snprintf+0x9e/0xd0 [ 487.076571] ? vsprintf+0x10/0x10 [ 487.077645] ? mutex_unlock+0x80/0xd0 [ 487.078695] ? __mutex_unlock_slowpath.isra.0+0x2d0/0x2d0 [ 487.079740] ? sget_fc+0x4e9/0x6b0 [ 487.080753] ? get_tree_bdev+0x388/0x660 [ 487.081715] get_tree_bdev+0x388/0x660 [ 487.082649] ? ext4_reconfigure+0x2250/0x2250 [ 487.083627] vfs_get_tree+0x81/0x2b0 [ 487.084608] ? ns_capable_common+0x57/0xe0 [ 487.085534] path_mount+0x47e/0x19d0 [ 487.086463] ? kasan_quarantine_put+0x55/0x180 [ 487.087400] ? finish_automount+0x5f0/0x5f0 [ 487.088314] ? user_path_at_empty+0x45/0x60 [ 487.089217] ? kmem_cache_free+0x1c2/0x4e0 [ 487.090086] do_mount+0xce/0xf0 [ 487.090859] ? path_mount+0x19d0/0x19d0 [ 487.091624] ? _copy_from_user+0x50/0x80 [ 487.092373] ? memdup_user+0x4e/0xa0 [ 487.093161] __x64_sys_mount+0x12c/0x1a0 [ 487.093918] do_syscall_64+0x38/0x90 [ 487.094678] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 487.095355] RIP: 0033:0x7f6c2ff6cc7e [ 487.096039] Code: 48 8b 0d 15 c2 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e2 c1 0c 00 f7 d8 64 89 01 48 [ 487.097528] RSP: 002b:00007fffe10578f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 487.098292] RAX: ffffffffffffffda RBX: 00007f6c3009e204 RCX: 00007f6c2ff6cc7e [ 487.099064] RDX: 000055b42bbf1e90 RSI: 000055b42bbeb370 RDI: 000055b42bbf1e30 [ 487.099839] RBP: 000055b42bbe9460 R08: 0000000000000000 R09: 00007f6c30039d60 [ 487.100548] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 487.101256] R13: 000055b42bbf1e30 R14: 000055b42bbf1e90 R15: 000055b42bbe9460 [ 487.101971] </TASK> [ 487.102677] Modules linked in: joydev input_leds serio_raw qemu_fw_cfg xfs autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx raid1 raid0 multipath linear qxl hid_generic usbhid drm_ttm_helper hid ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel psmouse crypto_simd cryptd [ 487.105863] ---[ end trace 0000000000000000 ]--- [ 487.106628] RIP: 0010:ext4_free_blocks+0x7c1/0x1e30 [ 487.107444] Code: 49 8d bf b8 02 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 42 11 00 00 49 8b 87 b8 02 00 00 4e 8d 24 e0 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 30 11 00 00 4d 8b 24 24 e8 4c df 71 ff 4f 8d 24 [ 487.109121] RSP: 0018:ffffc9000085f3c0 EFLAGS: 00010246 [ 487.109947] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000005 [ 487.110724] RDX: 0000000000000000 RSI: 0000000000001c06 RDI: ffff8881260a82b8 [ 487.111503] RBP: ffff88812a6c8000 R08: 00000000000000fe R09: 0000000000000030 [ 487.112324] R10: ffff8881260a8000 R11: 00000000000000fe R12: 0000000000000000 [ 487.113231] R13: ffff888108f9fec8 R14: 0000000000000001 R15: ffff8881260a8000 [ 487.114146] FS: 00007f6c2fd0c840(0000) GS:ffff888293680000(0000) knlGS:0000000000000000 [ 487.115238] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 487.116093] CR2: 00007f9e763a6400 CR3: 00000001058e6006 CR4: 0000000000370ee0 [ 487.117089] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 487.117994] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 -- You may reply to this email to add a comment. 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