linux-kernel - Re: [PATCH] fs/ntfs3: Check for NULL if ATTR_EA

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Message-ID: <debcf00f-c155-868f-9a49-f5595c550edb@paragon-software.com>
Date:   Wed, 6 Oct 2021 17:51:54 +0300
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     Kari Argillander <kari.argillander@...il.com>,
        Mohammad Rasim <mohammad.rasim96@...il.com>
CC:     <ntfs3@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] fs/ntfs3: Check for NULL if ATTR_EA_INFO is incorrect



On 03.10.2021 20:50, Kari Argillander wrote:
> On Wed, Sep 29, 2021 at 07:35:43PM +0300, Konstantin Komarov wrote:
>> This can be reason for reported panic.
>> Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
> 
> I see that you have include this to devel branch but you did not send V2
> [1]. 

>From patch thread:
"Is this public panic? If it is then put link here. If you have report
from panic you can put it here also. Patch itself looks correct."

I was thinking, that after adding link / Reported-by the patch is
good to commit.

> I also included Mohammad Rasim to this thread. Maybe they can test
> this patch. Rasim can you test [2] if your problem will be fixed with
> this tree. Or just test this patch if you prefer that way.
> 
> [1]: github.com/Paragon-Software-Group/linux-ntfs3/commit/35afb70dcfe4eb445060dd955e5b67d962869ce5
> [2]: github.com/Paragon-Software-Group/linux-ntfs3/tree/devel
> 
>> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
>> ---
>>  fs/ntfs3/frecord.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
>> index 9a53f809576d..007602badd90 100644
>> --- a/fs/ntfs3/frecord.c
>> +++ b/fs/ntfs3/frecord.c
>> @@ -3080,7 +3080,9 @@ static bool ni_update_parent(struct ntfs_inode *ni, struct NTFS_DUP_INFO *dup,
>>                         const struct EA_INFO *info;
>>  
>>                         info = resident_data_ex(attr, sizeof(struct EA_INFO));
>> -                       dup->ea_size = info->size_pack;
>> +                       /* If ATTR_EA_INFO exists 'info' can't be NULL. */
>> +                       if (info)
>> +                               dup->ea_size = info->size_pack;
>>                 }
>>         }
>>  
>> -- 
>> 2.33.0
>>