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Diffstat (limited to 'sound/usb/helper.c')
-rw-r--r--sound/usb/helper.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/sound/usb/helper.c b/sound/usb/helper.c
index 84aa265dd802..71d5f540334a 100644
--- a/sound/usb/helper.c
+++ b/sound/usb/helper.c
@@ -63,6 +63,20 @@ void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype
return NULL;
}
+/* check the validity of pipe and EP types */
+int snd_usb_pipe_sanity_check(struct usb_device *dev, unsigned int pipe)
+{
+ static const int pipetypes[4] = {
+ PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
+ };
+ struct usb_host_endpoint *ep;
+
+ ep = usb_pipe_endpoint(dev, pipe);
+ if (usb_pipetype(pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
+ return -EINVAL;
+ return 0;
+}
+
/*
* Wrapper for usb_control_msg().
* Allocates a temp buffer to prevent dmaing from/to the stack.
@@ -75,6 +89,9 @@ int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
void *buf = NULL;
int timeout;
+ if (snd_usb_pipe_sanity_check(dev, pipe))
+ return -EINVAL;
+
if (size > 0) {
buf = kmemdup(data, size, GFP_KERNEL);
if (!buf)