linux-kernel - Re: [PATCH] cifs: fix buffer overrun in parse_DFS

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Date:	Tue, 16 Dec 2008 21:34:45 -0600
From:	"Steve French" <smfrench@...il.com>
To:	"Jeff Layton" <jlayton@...hat.com>
Cc:	niallain@...il.com, smfrench@...tin.rr.com,
	linux-cifs-client@...ts.samba.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] cifs: fix buffer overrun in parse_DFS_referrals

Jeff.
Would you add my ack, and the cc: for stable and send to Linus?  I
think this should go in.

On Tue, Dec 16, 2008 at 9:04 AM, Jeff Layton <jlayton@...hat.com> wrote:
> While testing a kernel with memory poisoning enabled, I saw some warnings
> about the redzone getting clobbered when chasing DFS referrals. The
> buffer allocation for the unicode converted version of the searchName is
> too small and needs to take null termination into account.
>
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> ---
>  fs/cifs/cifssmb.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> index 9395928..824df14 100644
> --- a/fs/cifs/cifssmb.c
> +++ b/fs/cifs/cifssmb.c
> @@ -3992,7 +3992,8 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
>
>                node->flags = le16_to_cpu(pSMBr->DFSFlags);
>                if (is_unicode) {
> -                       __le16 *tmp = kmalloc(strlen(searchName)*2, GFP_KERNEL);
> +                       __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
> +                                               GFP_KERNEL);
>                        cifsConvertToUCS((__le16 *) tmp, searchName,
>                                        PATH_MAX, nls_codepage, remap);
>                        node->path_consumed = hostlen_fromUCS(tmp,
> --
> 1.5.5.1
>
>



-- 
Thanks,

Steve
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