linux-kernel - Re: [PATCH v3] smb2: fix uninitialized variable bug in smb2_ioctl_query

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Date:   Tue, 9 Oct 2018 18:11:55 -0500
From:   Steve French <smfrench@...il.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Steve French <sfrench@...ba.org>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] smb2: fix uninitialized variable bug in smb2_ioctl_query_info

Added Ronnie's reviewed-by and pushed to cifs-2.6.git for-next
On Tue, Oct 9, 2018 at 5:27 PM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
>
> There is a potential execution path in which variable *resp_buftype*
> is passed as an argument to function free_rsp_buf(), in which it is
> used in a comparison without being properly initialized previously.
>
> Fix this by initializing variable *resp_buftype* to CIFS_NO_BUFFER
> in order to avoid unpredictable or unintended results.
>
> Addresses-Coverity-ID: 1473971 ("Uninitialized scalar variable")
> Fixes: c5d25bdb2967 ("cifs: add IOCTL for QUERY_INFO passthrough to userspace")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
> Changes in v3:
>  - Initialize resp_buftype to CIFS_NO_BUFFER instead of to -1.
>    Thanks to Ronnie Sahlberg for pointing this out.
>
> Changes in v2:
>  - Fix Coverity and Fixes tag.
>  - Update commit log.
>
>  fs/cifs/smb2ops.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index c6c6450d..8472cb0 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -1133,7 +1133,7 @@ smb2_ioctl_query_info(const unsigned int xid,
>         struct smb_rqst rqst;
>         struct kvec iov[1];
>         struct kvec rsp_iov;
> -       int resp_buftype;
> +       int resp_buftype = CIFS_NO_BUFFER;
>         struct smb2_query_info_rsp *rsp = NULL;
>         void *buffer;
>
> --
> 2.7.4
>


-- 
Thanks,

Steve