linux-kernel - Re: [PATCH -next] scsi: aacraid: Use memdup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 24 Apr 2020 18:23:26 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Zou Wei <zou_wei@...wei.com>
Cc:     <aacraid@...rosemi.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] scsi: aacraid: Use memdup_user() as a cleanup


Zou,

> diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
> index ffe41bc..1ce1620 100644
> --- a/drivers/scsi/aacraid/commctrl.c
> +++ b/drivers/scsi/aacraid/commctrl.c
> @@ -513,17 +513,9 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
>  		goto cleanup;
>  	}
>  
> -	user_srbcmd = kmalloc(fibsize, GFP_KERNEL);
> -	if (!user_srbcmd) {
> -		dprintk((KERN_DEBUG"aacraid: Could not make a copy of the srb\n"));
> -		rcode = -ENOMEM;
> -		goto cleanup;
> -	}
> -	if(copy_from_user(user_srbcmd, user_srb,fibsize)){
> -		dprintk((KERN_DEBUG"aacraid: Could not copy srb from user\n"));
> -		rcode = -EFAULT;
> -		goto cleanup;
> -	}
> +	user_srbcmd = memdup_user(user_srb, fibsize);
> +	if (IS_ERR(user_srbcmd))
> +		return PTR_ERR(user_srbcmd);
>  
>  	flags = user_srbcmd->flags; /* from user in cpu order */
>  	switch (flags & (SRB_DataIn | SRB_DataOut)) {

This is not equivalent, is it? The original code does a goto cleanup;
whereas your patch returns on error.

-- 
Martin K. Petersen	Oracle Linux Engineering