MUSB: Add sanity check for maximum number of endpoints

There is no check if platform code passes in more endpoints (num_eps)
than the maximum number of enpoints (MUSB_C_NUM_EPS.)  The result is
that allocate_instance() happily writes past the end of 'struct musb'
corrupting memory.

This patch adds a BUG() if the platform code requests more than the max.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 128e949db47c..bd82253a3329 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1806,6 +1806,7 @@ allocate_instance(struct device *dev,
         musb->ctrl_base = mbase;
         musb->nIrq = -ENODEV;
         musb->config = config;
+        BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
         for (epnum = 0, ep = musb->endpoints;
                         epnum < musb->config->num_eps;
                         epnum++, ep++) {