The underflow in OZ_DATA_F_ISOC_FIXED seems not harmful, but this patch
is a clean up and makes my static checker a bit happier.
The underflow in OZ_VENDOR_CLASS_RSP seems like it could result in
memory corruption.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/staging/ozwpan/ozusbsvc1.c b/drivers/staging/ozwpan/ozusbsvc1.c
index f660bb1..301fee8 100644
--- a/drivers/staging/ozwpan/ozusbsvc1.c
+++ b/drivers/staging/ozwpan/ozusbsvc1.c
@@ -342,12 +342,16 @@ static void oz_usb_handle_ep_data(struct oz_usb_ctx *usb_ctx,
case OZ_DATA_F_ISOC_FIXED: {
struct oz_isoc_fixed *body =
(struct oz_isoc_fixed *)data_hdr;
- int data_len = len-sizeof(struct oz_isoc_fixed)+1;
+ int data_len;
int unit_size = body->unit_size;
u8 *data = body->data;
int count;
int i;
+ if (len < sizeof(struct oz_isoc_fixed) - 1)
+ break;
+ data_len = len - (sizeof(struct oz_isoc_fixed) - 1);
+
if (!unit_size)
break;
count = data_len/unit_size;
@@ -427,6 +431,11 @@ void oz_usb_rx(struct oz_pd *pd, struct oz_elt *elt)
case OZ_VENDOR_CLASS_RSP: {
struct oz_vendor_class_rsp *body =
(struct oz_vendor_class_rsp *)usb_hdr;
+
+ if (elt->length <
+ sizeof(struct oz_vendor_class_rsp) - 1)
+ break;
+
oz_hcd_control_cnf(usb_ctx->hport, body->req_id,
body->rcode, body->data, elt->length-
sizeof(struct oz_vendor_class_rsp)+1);
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