linux-kernel - Re: [BUG] fs: f2fs: Possible null-pointer dereferences in update_general

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Date:   Fri, 26 Jul 2019 11:39:04 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Chao Yu <yuchao0@...wei.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] fs: f2fs: Possible null-pointer dereferences in
 update_general_status()



On 2019/7/26 11:19, Chao Yu wrote:
> Hi Jiaju,
>
> Thanks for the report, I checked the code, and found it doesn't need to check
> SM_I(sbi) pointer, this is because in fill_super() and put_super(), we will call
> f2fs_destroy_stats() in prior to f2fs_destroy_segment_manager(), so if current
> sbi can still be visited in global stat list, SM_I(sbi) should be released yet.
> So anyway, let's remove unneeded check in line 70/78. :)

Okay, I will send a patch to remove unneeded checks.


Best wishes,
Jia-Ju Bai