linux-kernel - Re: [PATCH] cifs: dir: fix memory leak in cifs

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Date:   Fri, 20 Apr 2018 12:48:05 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Steve French <smfrench@...il.com>,
        Colin King <colin.king@...onical.com>
Cc:     Ronnie Sahlberg <lsahlber@...hat.com>,
        Steve French <sfrench@...ba.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] cifs: dir: fix memory leak in cifs_mknod

Hi Steve,

On 04/20/2018 12:37 PM, Steve French wrote:
> I noticed a similar problem with the tcon link leak on that (which
> Colin and Gustavo pointed out - thank you!) but also in another return
> statement, so updated the original patch of Ronnie's merging the fixes
> 
> https://git.samba.org/sfrench/cifs-2.6.git/?p=sfrench/cifs-2.6.git;a=commit;h=167bc5de08dc97695f9d5c7069c3e69f409ff80b
> 
> 
> Let me know if you see any problems with it.
> 

Looks correct to me.

Thanks
--
Gustavo

> On Fri, Apr 20, 2018 at 8:19 AM, Gustavo A. R. Silva
> <gustavo@...eddedor.com> wrote:
>> Free allocated memory for full_path and xid before return.
>>
>> Addresses-Coverity-ID: 1468029 ("Resource leak")
>> Fixes: 49162bfde140 ("cifs: do not allow creating sockets except with
>> SMB1 posix exensions")
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>   fs/cifs/dir.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
>> index f0a759d..71e32d9 100644
>> --- a/fs/cifs/dir.c
>> +++ b/fs/cifs/dir.c
>> @@ -684,8 +684,11 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
>>                  goto mknod_out;
>>          }
>>
>> -       if (!S_ISCHR(mode) && !S_ISBLK(mode))
>> +       if (!S_ISCHR(mode) && !S_ISBLK(mode)) {
>> +               kfree(full_path);
>> +               free_xid(xid);
>>                  return -EPERM;
>> +       }
>>
>>          if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
>>                  goto mknod_out;
>> --
>> 2.7.4
>>
>> --
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> 
> 
>