[f2fs-dev] [Bug 220575] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000

[bugzilla-daemon--- via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

https://bugzilla.kernel.org/show_bug.cgi?id=220575

--- Comment #14 from JY (JY.Ho@mediatek.com) ---
(In reply to Chao Yu from comment #12)
> Hi JY,
> 
> I've figured out a reproducer as below:
> 
> 1. mkdir /mnt/f2fs/enc & encrypt /mnt/f2fs/enc
> 
> 2. Run below script in shell #1:
> for ((i=1;i>0;i++)) do xfs_io -f /mnt/f2fs/enc/file \
> -c "pwrite 0 32k" -c "fdatasync"
> 
> 3. Run below script in shell #2:
> for ((i=1;i>0;i++)) do xfs_io -f /mnt/f2fs/enc/file \
> -c "pwrite 0 32k" -c "fdatasync"
> 
> Now, testing below fix.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/
> ?h=bugfix/syzbot&id=1d024fd4c6fed3767f063db79746bcd2d0be49d1

Hi Chao,

In my kernel version (
https://android.googlesource.com/kernel/common/+/refs/heads/android16-6.12-2025-07/fs/f2fs/data.c#926),
Should I modify:
- inc_page_count(fio->sbi, WB_DATA_TYPE(page, false));
+ inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page, false));
Is that right?

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