Re: [PATCH AUTOSEL 6.1 07/16] smb3: missing null check in SMB2_change_notify
From: Pavel Machek
Date: Fri Jun 16 2023 - 15:39:33 EST
Hi!
> From: Steve French <stfrench@xxxxxxxxxxxxx>
>
> [ Upstream commit b535cc796a4b4942cd189652588e8d37c1f5925a ]
>
> If plen is null when passed in, we only checked for null
> in one of the two places where it could be used. Although
> plen is always valid (not null) for current callers of the
> SMB2_change_notify function, this change makes it more consistent.
Changelog explains problem can not happen, so... is this important
enough to backport?
Best regards,
Pavel
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <error27@xxxxxxxxx>
> Closes: https://lore.kernel.org/all/202305251831.3V1gbbFs-lkp@xxxxxxxxx/
> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> ---
> fs/cifs/smb2pdu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
> index 537e8679900b8..3ca593cdda76e 100644
> --- a/fs/cifs/smb2pdu.c
> +++ b/fs/cifs/smb2pdu.c
> @@ -3779,7 +3779,7 @@ SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
> if (*out_data == NULL) {
> rc = -ENOMEM;
> goto cnotify_exit;
> - } else
> + } else if (plen)
> *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
> }
>
--
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