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[media] lirc: cannot read from tx-only device 

Bail out early, otherwise we follow a null pointer.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2017-02-01 20:08:56 -02:00 committed by Mauro Carvalho Chehab
parent 7a6628b5c3
commit 32002f725f
1 changed files with 3 additions and 0 deletions
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3
drivers/media/rc/lirc_dev.c
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@ -647,6 +647,9 @@ ssize_t lirc_dev_fop_read(struct file *file,
return -ENODEV; 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); dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor);
buf = kzalloc(ir->chunk_size, GFP_KERNEL); buf = kzalloc(ir->chunk_size, GFP_KERNEL);