linux-ext4 - Re: [PATCH] ext2: add additinal sanity check for ext2_acl_from

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Message-ID: <a270c00f-317f-b4d0-5cbc-b60ce8683e1d@gmx.com>
Date:   Mon, 3 Sep 2018 21:24:58 +0800
From:   cgxu519 <cgxu519@....com>
To:     Jan Kara <jack@...e.cz>
Cc:     jack@...e.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext2: add additinal sanity check for ext2_acl_from_disk()

On 09/03/2018 07:58 PM, Jan Kara wrote:
> On Sun 02-09-18 23:31:00, Chengguang Xu wrote:
>> In the case ACL_USER and ACL_GROUP we check if value has exceeded end,
>> add same check in the case ACL_OTHER as well.
>>
>> Signed-off-by: Chengguang Xu <cgxu519@....com>
>> ---
>>   fs/ext2/acl.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
>> index 224c04abb2e5..3082d93f1cb1 100644
>> --- a/fs/ext2/acl.c
>> +++ b/fs/ext2/acl.c
>> @@ -53,6 +53,8 @@ ext2_acl_from_disk(const void *value, size_t size)
>>   			case ACL_OTHER:
>>   				value = (char *)value +
>>   					sizeof(ext2_acl_entry_short);
>> +				if ((char *)value > end)
>> +					goto fail;
> This is not needed. This condition is already checked 10 lines above...

Ah, you are right, I just missed that...

Thanks,