Re: [PATCH 5.15 v3] mm/filemap: fix UAF in find_lock_entries

[Liu Shixin]

On 2022/7/6 22:08, Matthew Wilcox wrote:
> On Wed, Jul 06, 2022 at 03:45:27PM +0800, Liu Shixin wrote:
>>  	rcu_read_lock();
>>  	while ((page = find_get_entry(&xas, end, XA_PRESENT))) {
>> +		unsigned long next_idx = xas.xa_index;
> It's confusing to have next_idx not be the actual next index.
> That was why I made it 'xas.xa_index + 1'.  I know it's somewhat
> used as an indicator that we don't need to call xas_set(), and so
> it doesn't really matter, but let's say what we mean.
I'll modify it and resend again, thanks.
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