From 32002f725fc708dccc6263b19b56fa3d91626be1 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Wed, 1 Feb 2017 20:08:56 -0200 Subject: [PATCH] [media] lirc: cannot read from tx-only device Bail out early, otherwise we follow a null pointer. Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/lirc_dev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c index 0030ce01babc..a54ca531d8ef 100644 --- a/drivers/media/rc/lirc_dev.c +++ b/drivers/media/rc/lirc_dev.c @@ -647,6 +647,9 @@ ssize_t lirc_dev_fop_read(struct file *file, return -ENODEV; } + if (!LIRC_CAN_REC(ir->d.features)) + return -EINVAL; + dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); buf = kzalloc(ir->chunk_size, GFP_KERNEL); -- 2.20.1