[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 #18 from Chao Yu (chao@kernel.org) ---
(In reply to JY from comment #16)
> I tried to modified:
> + set_page_private(bounce_page, (unsigned long)0x5566F2F5);
> 
> But I got two results from different panics. 
> fscrypt_pagecache_page(page):0x000000005566f2f5 and 
> 
> fscrypt_pagecache_page(page):0x0000000000000000 (As shown below)

I think this is the same issue, actually, value of page->private should be
unpredictable, because this is a UAF issue, we don't know how system changes
the page after we freed it.

So, can you please test the fix to check whether it can solve your problem or
not? Thanks a lot. :)

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