NFC: pn533: Fix use after free

commit 770f750bc2b8312489c8e45306f551d08a319d3c upstream.

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>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index cb6204f..eeb0d59 100644 (file)
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1385,12 +1385,8 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, int target_idx,
        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;
 }