From d5f028c00f096f00133f1c3134919d2a31e4e95d Mon Sep 17 00:00:00 2001
From: Kenneth Aafloy <devnull@localhost>
Date: Fri, 16 Jul 2004 19:24:59 +0000
Subject:  - Do not allow write (and related) ioctls when frontend is opened
 RDONLY.

---
 linux/drivers/media/dvb/dvb-core/dvb_frontend.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'linux')

diff --git a/linux/drivers/media/dvb/dvb-core/dvb_frontend.c b/linux/drivers/media/dvb/dvb-core/dvb_frontend.c
index 7748ba9b6..c68c57116 100644
--- a/linux/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/linux/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -709,6 +709,11 @@ static int dvb_frontend_ioctl (struct inode *inode, struct file *file,
 	if (!fe || !fe->frontend.ioctl || fe->exit)
 		return -ENODEV;
 
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
+	    (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
+	     cmd == FE_DISEQC_RECV_SLAVE_REPLY))
+		return -EPERM;
+
 	if (down_interruptible (&fe->sem))
 		return -ERESTARTSYS;
 
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