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 ebdcecd..5e78c77 100644 (file)
--- 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;