[PATCH] staging: comedi: drivers: prevent memory leak

[Navid Emamdoost]

In das1800_attach, the buffer allocated via kmalloc_array needs to be
released if an error happens.

Signed-off-by: Navid Emamdoost <navid.emamdo...@gmail.com>
---
 drivers/staging/comedi/drivers/das1800.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das1800.c 
b/drivers/staging/comedi/drivers/das1800.c
index f16aa7e9f4f3..5f2d5f7a6229 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -1237,12 +1237,16 @@ static int das1800_attach(struct comedi_device *dev,
 
        dev->pacer = comedi_8254_init(dev->iobase + DAS1800_COUNTER,
                                      I8254_OSC_BASE_5MHZ, I8254_IO8, 0);
-       if (!dev->pacer)
+       if (!dev->pacer) {
+               kfree(devpriv->fifo_buf);
                return -ENOMEM;
+       }
 
        ret = comedi_alloc_subdevices(dev, 4);
-       if (ret)
+       if (ret) {
+               kfree(devpriv->fifo_buf);
                return ret;
+       }
 
        /*
         * Analog Input subdevice
@@ -1290,8 +1294,10 @@ static int das1800_attach(struct comedi_device *dev,
                s->insn_write   = das1800_ao_insn_write;
 
                ret = comedi_alloc_subdev_readback(s);
-               if (ret)
+               if (ret) {
+                       kfree(devpriv->fifo_buf);
                        return ret;
+               }
 
                /* initialize all channels to 0V */
                for (i = 0; i < s->n_chan; i++) {
-- 
2.17.1