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

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Date:   Tue, 10 May 2022 15:50:20 -0700
From:   Tadeusz Struk <tadeusz.struk@...aro.org>
To:     Namjae Jeon <linkinjeon@...nel.org>
Cc:     Sungjong Seo <sj1557.seo@...sung.com>,
        linux-fsdevel@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+a4087e40b9c13aad7892@...kaller.appspotmail.com
Subject: Re: [PATCH] exfat: check if cluster num is valid

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
-- 
Thanks,
Tadeusz