[PREVIEW] [PATCH] staging: erofs: fix potential overflow in z_erofs_vle_normalaccess_readpage{,s}

[Chao Yu]

Hi Xiang,

On 2018/8/23 19:16, Gao Xiang wrote:
> Hi Chao,
> 
> On 2018/8/23 19:02, Chao Yu wrote:
>> On 2018/8/23 17:19, Gao Xiang wrote:
>>> As Dan reported in the LKP mailing list:
>>> https://lists.01.org/pipermail/kbuild-all/2018-August/051558.html
>>>
>>> New smatch warnings:
>>> drivers/staging/erofs/unzip_vle.c:1359 z_erofs_vle_normalaccess_readpages() warn: should '()->index << 12' be a 64 bit type?
>>>
>>> Old smatch warnings:
>>> drivers/staging/erofs/unzip_vle.c:1322 z_erofs_vle_normalaccess_readpage() warn: should 'page->index << 12' be a 64 bit type?
>>>
>>> It needs to cast variable's type to erofs_off_t before left shifting.
>>>
>>> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
>>> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
>>
>> Reviewed-by: Chao Yu <yuchao0 at huawei.com>
>>
>>> ---
>>>
>>> Hi Chao,
>>>
>>> This patch is based on
>>> `staging: erofs: fix potential overflow in erofs_grab_bio()'
>>> in order to avoid patch conflict when rebasing.
>>>
>>> I think it is better to rearrange the commit order in the erofs branch and
>>> it needs to be sent separately in advance to Greg.
>>
>> Agreed, let me add this into erofs branch later.
>>
>> Thanks,
> 
> OK, I will send to Greg appended to the upstream commit
> `staging: erofs: fix potential overflow in erofs_grab_bio()`
> after you add this into erofs branch and receive the successful daily lkp report.

It's okay to me, please go ahead as you plan.

Thanks,

> 
> Thanks,
> Gao XIang
> 
>>
>>>
>>> Thanks,
>>> Gao Xiang
>>>
>>>  drivers/staging/erofs/unzip_vle.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
>>> index 6c4c928..22f9a02 100644
>>> --- a/drivers/staging/erofs/unzip_vle.c
>>> +++ b/drivers/staging/erofs/unzip_vle.c
>>> @@ -1314,7 +1314,7 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
>>>  	LIST_HEAD(pagepool);
>>>  
>>>  #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
>>> -	f.cachedzone_la = page->index << PAGE_SHIFT;
>>> +	f.cachedzone_la = (erofs_off_t)page->index << PAGE_SHIFT;
>>>  #endif
>>>  	err = z_erofs_do_read_page(&f, page, &pagepool);
>>>  	(void)z_erofs_vle_work_iter_end(&f.builder);
>>> @@ -1347,7 +1347,7 @@ static inline int __z_erofs_vle_normalaccess_readpages(
>>>  	LIST_HEAD(pagepool);
>>>  
>>>  #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
>>> -	f.cachedzone_la = lru_to_page(pages)->index << PAGE_SHIFT;
>>> +	f.cachedzone_la = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
>>>  #endif
>>>  	for (; nr_pages; --nr_pages) {
>>>  		struct page *page = lru_to_page(pages);
>>>
>>
> 
> .
>