Re: [PATCH] btrfs-progs: Check the csum tree node before go through the csum tree

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

Oh, I'm sorry that the patch is still needed...

Wang's patch did fix the problem...

Thanks,
Qu
-------- Original Message --------
Subject: Re: [PATCH] btrfs-progs: Check the csum tree node before go 
through the csum tree
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
To: <linux-btrfs@vger.kernel.org>
Date: 2014年10月06日 09:15
> Please ignore this patch since Wang's patch has already fixed them.
>
> https://patchwork.kernel.org/patch/4254631/
>
> Thanks,
> Qu
> -------- Original Message --------
> Subject: [PATCH] btrfs-progs: Check the csum tree node before go 
> through the csum tree
> From: Qu Wenruo <quwenruo@cn.fujitsu.com>
> To: <linux-btrfs@vger.kernel.org>
> Date: 2014年09月30日 16:52
>> [BUG]
>> Some fsfuzzed btrfs image will cause btrfsck segfault.
>>
>> [REPRODUCER]
>> Run btrfsck on a csum tree block corrupted image.
>>
>> [REASON]
>> check_csums() function call btrfs_search_slot() on csum_tree but doesn't
>> check whether the csum_tree contains a valid extent_buffer, which causes
>> the segfault.
>>
>> [FIX]
>> Check the csum_root->node before any search.
>>
>> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
>> ---
>>   cmds-check.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/cmds-check.c b/cmds-check.c
>> index 9471709..537376a 100644
>> --- a/cmds-check.c
>> +++ b/cmds-check.c
>> @@ -3905,6 +3905,10 @@ static int check_csums(struct btrfs_root *root)
>>       unsigned long leaf_offset;
>>         root = root->fs_info->csum_root;
>> +    if (!extent_buffer_uptodate(root->node)) {
>> +        fprintf(stderr, "No valid csum tree found\n");
>> +        return -ENOENT;
>> +    }
>>         key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
>>       key.type = BTRFS_EXTENT_CSUM_KEY;
>
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