On 16/12/16 15:03, Jeff Mahoney wrote:
> On 12/16/16 7:20 AM, Colin King wrote:
>> From: Colin Ian King <colin.k...@canonical.com>
>>
>> inode is being deferenced and then inode is checked to see if it
>> is null, implying we potentially could have a null pointer deference
>> on inode.
>>
>> Found with static analysis by CoverityScan, CID 1389472
>>
>> Fix this by dereferencing inode only after the inode null check.
>>
>> Fixes: 0b246afa62b0cf5 ("btrfs: root->fs_info cleanup, add fs_info
>> convenience variables")
>
> Hi Colin -
>
> Thanks for the review. The right fix here is to eliminate the tests for
> inode == NULL entirely. This is a callback for exportfs, which will
> itself crash if dentry->d_inode or parent->d_inode is NULL. Removing
> the tests would be consistent with other file systems.
Ah, thanks for pointing that out. New patch on it's way soon.
Colin
>
> -Jeff
>
>> Signed-off-by: Colin Ian King <colin.k...@canonical.com>
>> ---
>> fs/btrfs/export.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
>> index 340d907..b746d2b 100644
>> --- a/fs/btrfs/export.c
>> +++ b/fs/btrfs/export.c
>> @@ -223,7 +223,7 @@ static int btrfs_get_name(struct dentry *parent, char
>> *name,
>> {
>> struct inode *inode = d_inode(child);
>> struct inode *dir = d_inode(parent);
>> - struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
>> + struct btrfs_fs_info *fs_info;
>> struct btrfs_path *path;
>> struct btrfs_root *root = BTRFS_I(dir)->root;
>> struct btrfs_inode_ref *iref;
>> @@ -241,6 +241,7 @@ static int btrfs_get_name(struct dentry *parent, char
>> *name,
>> if (!S_ISDIR(dir->i_mode))
>> return -EINVAL;
>>
>> + fs_info = btrfs_sb(inode->i_sb);
>> ino = btrfs_ino(inode);
>>
>> path = btrfs_alloc_path();
>>
>
>
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