linux-kernel - Re: [PATCH RFC v3 4/7] epoll: Add implementation for epoll_ctl

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Message-ID: <54DE9179.6080401@gmail.com>
Date:	Fri, 13 Feb 2015 19:06:17 -0500
From:	Dan Rosenberg <dan.j.rosenberg@...il.com>
To:	famz@...hat.com
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC v3 4/7] epoll: Add implementation for epoll_ctl_batch


> +	if (ncmds <= 0 || !cmds)
> +		return -EINVAL;
> +	cmd_size = sizeof(struct epoll_ctl_cmd) * ncmds;
> +	kcmds = kmalloc(cmd_size, GFP_KERNEL);
You should probably fix the integer overflow in the calculation of the
cmd_size variable, unless you like root vulnerabilities.

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