CVE-2023-54196

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: Fix NULL pointer dereference in 'niwriteinode'

Syzbot found the following issue: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000016 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010af56000 [0000000000000016] pgd=08000001090da003, p4d=08000001090da003, pud=08000001090ce003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3036 Comm: syz-executor206 Not tainted 6.0.0-rc6-syzkaller-17739-g16c9f284e746 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : isrecinuse fs/ntfs3/ntfs.h:313 [inline] pc : niwriteinode+0xac/0x798 fs/ntfs3/frecord.c:3232 lr : niwriteinode+0xa0/0x798 fs/ntfs3/frecord.c:3226 sp : ffff8000126c3800 x29: ffff8000126c3860 x28: 0000000000000000 x27: ffff0000c8b02000 x26: ffff0000c7502320 x25: ffff0000c7502288 x24: 0000000000000000 x23: ffff80000cbec91c x22: ffff0000c8b03000 x21: ffff0000c8b02000 x20: 0000000000000001 x19: ffff0000c75024d8 x18: 00000000000000c0 x17: ffff80000dd1b198 x16: ffff80000db59158 x15: ffff0000c4b6b500 x14: 00000000000000b8 x13: 0000000000000000 x12: ffff0000c4b6b500 x11: ff80800008be1b60 x10: 0000000000000000 x9 : ffff0000c4b6b500 x8 : 0000000000000000 x7 : ffff800008be1b50 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: isrecinuse fs/ntfs3/ntfs.h:313 [inline] niwriteinode+0xac/0x798 fs/ntfs3/frecord.c:3232 ntfsevictinode+0x54/0x84 fs/ntfs3/inode.c:1744 evict+0xec/0x334 fs/inode.c:665 iputfinal fs/inode.c:1748 [inline] iput+0x2c4/0x324 fs/inode.c:1774 ntfsnewinode+0x7c/0xe0 fs/ntfs3/fsntfs.c:1660 ntfscreateinode+0x20c/0xe78 fs/ntfs3/inode.c:1278 ntfscreate+0x54/0x74 fs/ntfs3/namei.c:100 lookupopen fs/namei.c:3413 [inline] openlastlookups fs/namei.c:3481 [inline] pathopenat+0x804/0x11c4 fs/namei.c:3688 dofilpopen+0xdc/0x1b8 fs/namei.c:3718 dosysopenat2+0xb8/0x22c fs/open.c:1311 dosysopen fs/open.c:1327 [inline] __dosysopenat fs/open.c:1343 [inline] __sesysopenat fs/open.c:1338 [inline] __arm64sysopenat+0xb0/0xe0 fs/open.c:1338 __invokesyscall arch/arm64/kernel/syscall.c:38 [inline] invokesyscall arch/arm64/kernel/syscall.c:52 [inline] el0svccommon+0x138/0x220 arch/arm64/kernel/syscall.c:142 doel0svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t64synchandler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t64sync+0x18c/0x190 Code: 97dafee4 340001b4 f9401328 2a1f03e0 (79402d14) ---[ end trace 0000000000000000 ]---

Above issue may happens as follows: ntfsnewinode miinit mi->mrec = kmalloc(sbi->recordsize, GFPNOFS); -->failed to allocate memory if (!mi->mrec) return -ENOMEM; iput iputfinal evict ntfsevictinode niwriteinode isrecinuse(ni->mi.mrec)-> As 'ni->mi.mrec' is NULL trigger NULL-ptr-deref

To solve above issue if new inode failed make inode bad before call 'iput()' in 'ntfsnewinode()'.