Re: [PATCH] exfat: check if cluster num is valid

[Tadeusz Struk]

Hi Jeon,
On 4/21/22 22:54, Namjae Jeon wrote:
> > Call Trace:
> >   __dump_stack lib/dump_stack.c:77 [inline]
> >   dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
> >   print_address_description+0x81/0x3c0 mm/kasan/report.c:233
> >   __kasan_report mm/kasan/report.c:419 [inline]
> >   kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
> >   __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
> >   exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174
> >   exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181
> >   __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217
> >   exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243
> >   exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339
> >   notify_change+0xb76/0xe10 fs/attr.c:336
> >   do_truncate+0x1ea/0x2d0 fs/open.c:65
> Could you please share how to reproduce this ?

Sorry, I missed this.
The reproducer [1] can be found on the syzbot report website [2]

[1] https://syzkaller.appspot.com/text?tag=ReproC&x=1353dfdf700000
[2] https://syzkaller.appspot.com/bug?id=50381fc73821ecae743b8cf24b4c9a04776f767c
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Thanks,
Tadeusz