From: Xi Wang <xi.wang@gmail.com>
Date: Fri, 25 Nov 2011 21:46:51 +0000 (-0500)
Subject: Staging: comedi: fix integer overflow in do_insnlist_ioctl()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dfd8ee92a9192d78aa38cf8699df3630a7c88c85;p=linux-beck.git

Staging: comedi: fix integer overflow in do_insnlist_ioctl()

There is a potential integer overflow in do_insnlist_ioctl() if
userspace passes in a large insnlist.n_insns.  The call to kmalloc()
would allocate a small buffer, leading to a memory corruption.

The bug was reported by Dan Carpenter <dan.carpenter@oracle.com>
and Haogang Chen <haogangchen@gmail.com>.  The patch was suggested by
Ian Abbott <abbotti@mev.co.uk> and Lars-Peter Clausen <lars@metafoo.de>.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Haogang Chen <haogangchen@gmail.com>.
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index ebdcecda3583..5e78c77d5a08 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -671,7 +671,7 @@ static int do_insnlist_ioctl(struct comedi_device *dev,
 	}
 
 	insns =
-	    kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
+	    kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
 	if (!insns) {
 		DPRINTK("kmalloc failed\n");
 		ret = -ENOMEM;