Sanity check counts

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@216 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 4 insertions, 0 deletions

diff --git a/zaptel.c b/zaptel.c
index db098f6..4ad2715 100755
--- a/zaptel.c
+++ b/zaptel.c
@@ -1394,6 +1394,8 @@ static ssize_t zt_chan_read(struct file *file, char *usrbuf, size_t count, int u
 	int res, rv;
 	int oldbuf,x;
 	unsigned long flags;
+	/* Make sure count never exceeds 65k, and make sure it's unsigned */
+	count &= 0xffff;
 	if (!chan) 
 		return -EINVAL;
 	if (count < 1)
@@ -1470,6 +1472,8 @@ static ssize_t zt_chan_write(struct file *file, const char *usrbuf, size_t count
 	unsigned long flags;
 	struct zt_chan *chan = chans[unit];
 	int res, amnt, oldbuf, rv,x;
+	/* Make sure count never exceeds 65k, and make sure it's unsigned */
+	count &= 0xffff;
 	if (!chan) 
 		return -EINVAL;
 	if (count < 1)