lock some parameters (bug #3312)

git-svn-id: http://svn.digium.com/svn/zaptel/branches/v1-0@545 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 3 insertions, 1 deletions

diff --git a/zaptel.c b/zaptel.c
index a1f2f8d..2afd616 100755
--- a/zaptel.c
+++ b/zaptel.c
@@ -4080,19 +4080,21 @@ static int zt_chan_ioctl(struct inode *inode, struct file *file, unsigned int cm
 		rv = 0;
 		break;
 	case ZT_HOOK:
+		get_user(j,(int *)data);
 		if (chan->flags & ZT_FLAG_CLEAR)
 			return -EINVAL;
 		if (chan->sig == ZT_SIG_CAS) 
 			return -EINVAL;
 		/* if no span, just do nothing */
 		if (!chan->span) return(0);
+		spin_lock_irqsave(&chan->lock, flags);
 		/* if dialing, stop it */
 		chan->curtone = NULL;
 		chan->dialing = 0;
 		chan->txdialbuf[0] = '\0';
 		chan->tonep = 0;
 		chan->pdialcount = 0;
-		get_user(j,(int *)data);
+		spin_unlock_irqrestore(&chan->lock, flags);
 		if (chan->span->flags & ZT_FLAG_RBS) {
 			switch (j) {
 			case ZT_ONHOOK: