[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 #7 from Chao Yu (chao@kernel.org) ---
Can you please hook fscrypt_free_bounce_page() to set page private w/ special
value, something as below:

void fscrypt_free_bounce_page(struct page *bounce_page)
{
        if (!bounce_page)
                return;
        set_page_private(bounce_page, (unsigned long)0xF2F52011);
        ClearPagePrivate(bounce_page);
        mempool_free(bounce_page, fscrypt_bounce_page_pool);
}

And add some check conditions in f2fs_is_cp_guaranteed() to see whether the
page has been freed before inc_page_count().

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