In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: return EIO on RAID1 block group write pointer mismatch There was a bug report about a NULL pointer dereference in btrfsaddfreespacezoned() that ultimately happens because a conversion from the default metadata profile DUP to a RAID1 profile on two disks. The stack trace has the following signature: BTRFS error (device sdc): zoned: write pointer offset mismatch of zones in raid1 profile BUG: kernel NULL pointer dereference, address: 0000000000000058 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:btrfsaddfreespacezoned.isra.0+0x61/0x1a0 RSP: 0018:ffffa236b6f3f6d0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff96c8132f3400 RCX: 0000000000000001 RDX: 0000000010000000 RSI: 0000000000000000 RDI: ffff96c8132f3410 RBP: 0000000010000000 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000000 R13: ffff96c758f65a40 R14: 0000000000000001 R15: 000011aac0000000 FS: 00007fdab1cb2900(0000) GS:ffff96e60ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000058 CR3: 00000001a05ae000 CR4: 0000000000350ef0 Call Trace: <TASK> ? _diebody.cold+0x19/0x27 ? pagefaultoops+0x15c/0x2f0 ? excpagefault+0x7e/0x180 ? asmexcpagefault+0x26/0x30 ? _btrfsaddfreespacezoned.isra.0+0x61/0x1a0 btrfsaddfreespaceasynctrimmed+0x34/0x40 btrfsaddnewfreespace+0x107/0x120 btrfsmakeblockgroup+0x104/0x2b0 btrfscreatechunk+0x977/0xf20 btrfschunkalloc+0x174/0x510 ? srsoreturnthunk+0x5/0x5f btrfsincblockgroupro+0x1b1/0x230 btrfsrelocateblockgroup+0x9e/0x410 btrfsrelocatechunk+0x3f/0x130 btrfsbalance+0x8ac/0x12b0 ? srsoreturnthunk+0x5/0x5f ? srsoreturnthunk+0x5/0x5f ? _kmalloccachenoprof+0x14c/0x3e0 btrfsioctl+0x2686/0x2a80 ? srsoreturnthunk+0x5/0x5f ? ioctlhasperm.constprop.0.isra.0+0xd2/0x120 _x64sysioctl+0x97/0xc0 dosyscall64+0x82/0x160 ? srsoreturnthunk+0x5/0x5f ? _memcgslabfreehook+0x11a/0x170 ? srsoreturnthunk+0x5/0x5f ? kmemcachefree+0x3f0/0x450 ? srsoreturnthunk+0x5/0x5f ? srsoreturnthunk+0x5/0x5f ? syscallexittousermode+0x10/0x210 ? srsoreturnthunk+0x5/0x5f ? dosyscall64+0x8e/0x160 ? sysfsemit+0xaf/0xc0 ? srsoreturnthunk+0x5/0x5f ? srsoreturnthunk+0x5/0x5f ? seqreaditer+0x207/0x460 ? srsoreturnthunk+0x5/0x5f ? vfsread+0x29c/0x370 ? srsoreturnthunk+0x5/0x5f ? srsoreturnthunk+0x5/0x5f ? syscallexittousermode+0x10/0x210 ? srsoreturnthunk+0x5/0x5f ? dosyscall64+0x8e/0x160 ? srsoreturnthunk+0x5/0x5f ? excpagefault+0x7e/0x180 entrySYSCALL64afterhwframe+0x76/0x7e RIP: 0033:0x7fdab1e0ca6d RSP: 002b:00007ffeb2b60c80 EFLAGS: 00000246 ORIGRAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdab1e0ca6d RDX: 00007ffeb2b60d80 RSI: 00000000c4009420 RDI: 0000000000000003 RBP: 00007ffeb2b60cd0 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeb2b6343b R14: 00007ffeb2b60d80 R15: 0000000000000001 </TASK> CR2: 0000000000000058 ---[ end trace 0000000000000000 ]--- The 1st line is the most interesting here: BTRFS error (device sdc): zoned: write pointer offset mismatch of zones in raid1 profile When a RAID1 block-group is created and a write pointer mismatch between the disks in the RAID set is detected, btrfs sets the allocoffset to the length of the block group marking it as full. Afterwards the code expects that a balance operation will evacuate the data in this block-group and repair the problems. But before this is possible, the new space of this block-group will be accounted in the free space cache. But in _btrfs ---truncated---
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