NFC: pn533: Fix use after free

cmd was freed in pn533_dep_link_up regardless of
pn533_send_cmd_frame_async return code. Cmd is passed as argument to
pn533_in_dep_link_up_complete callback and should be freed there.

Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 328f2b6..84a2e77 100644 (file)
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1820,12 +1820,8 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
        rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
                                dev->in_maxlen, pn533_in_dep_link_up_complete,
                                cmd, GFP_KERNEL);
-       if (rc)
-               goto out;
-
-
-out:
-       kfree(cmd);
+       if (rc < 0)
+               kfree(cmd);
 
        return rc;
 }