CVE-2023-53616

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

jfs: fix invalid free of JFSIP(ipimap)->iimap in diUnmount

syzbot found an invalid-free in diUnmount:

BUG: KASAN: double-free in slab_free mm/slub.c:3661 [inline] BUG: KASAN: double-free in __kmemcachefree+0x71/0x110 mm/slub.c:3674 Free of addr ffff88806f410000 by task syz-executor131/3632

CPU: 0 PID: 3632 Comm: syz-executor131 Not tainted 6.1.0-rc7-syzkaller-00012-gca57f02295f1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> __dumpstack lib/dumpstack.c:88 [inline] dump_stacklvl+0x1b1/0x28e lib/dumpstack.c:106 printaddressdescription+0x74/0x340 mm/kasan/report.c:284 printreport+0x107/0x1f0 mm/kasan/report.c:395 kasanreportinvalidfree+0xac/0xd0 mm/kasan/report.c:460 ____kasanslabfree+0xfb/0x120 kasanslabfree include/linux/kasan.h:177 [inline] slabfreehook mm/slub.c:1724 [inline] slabfreefreelisthook+0x12e/0x1a0 mm/slub.c:1750 slabfree mm/slub.c:3661 [inline] __kmemcachefree+0x71/0x110 mm/slub.c:3674 diUnmount+0xef/0x100 fs/jfs/jfsimap.c:195 jfsumount+0x108/0x370 fs/jfs/jfsumount.c:63 jfsputsuper+0x86/0x190 fs/jfs/super.c:194 genericshutdownsuper+0x130/0x310 fs/super.c:492 killblocksuper+0x79/0xd0 fs/super.c:1428 deactivatelockedsuper+0xa7/0xf0 fs/super.c:332 cleanupmnt+0x494/0x520 fs/namespace.c:1186 taskworkrun+0x243/0x300 kernel/taskwork.c:179 exittaskwork include/linux/taskwork.h:38 [inline] doexit+0x664/0x2070 kernel/exit.c:820 dogroup_exit+0x1fd/0x2b0 kernel/exit.c:950 __dosysexit_group kernel/exit.c:961 [inline] __sesysexit_group kernel/exit.c:959 [inline] _x64sysexitgroup+0x3b/0x40 kernel/exit.c:959 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x3d/0xb0 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd [...]

JFSIP(ipimap)->iimap is not setting to NULL after free in diUnmount. If jfsremount() free JFSIP(ipimap)->iimap but then failed at diMount(). JFSIP(ipimap)->iimap will be freed once again. Fix this problem by setting JFSIP(ipimap)->i_imap to NULL after free.