[media] Staging: media/lirc: don't call put_ir_rx on rx twice

There is an exit path where rx is kfree'd on put_ir_rx and then
a jump to label out_put_xx will again kfree it with another
call to put_ir_rx.  Fix this by adding a new label that avoids
this 2nd call to put_ir_rx for this specific case.

Detected with CoverityScan, CID#145119 ("Use after free")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index e4a533b..2473552 100644 (file)
--- a/drivers/staging/media/lirc/lirc_zilog.c
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -1597,7 +1597,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
                        i2c_set_clientdata(client, NULL);
                        put_ir_rx(rx, true);
                        ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
-                       goto out_put_xx;
+                       goto out_put_tx;
                }
 
                /* Proceed only if the Tx client is also ready */
@@ -1637,6 +1637,7 @@ out_ok:
 out_put_xx:
        if (rx != NULL)
                put_ir_rx(rx, true);
+out_put_tx:
        if (tx != NULL)
                put_ir_tx(tx, true);
 out_put_ir: