Description: Check the return value of kmalloc() in function mos7840_get_reg(), in file drivers/usb/serial/mos7840.c.
Signed-off-by: Amit Choudhary <[email protected]>
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 021be39..91d474b 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -475,6 +475,14 @@ static int mos7840_get_reg(struct moschi
int ret = 0;
buffer = (__u8 *) mcs->ctrl_buf;
+ /* The memory for ctrl_buf is allocated in
+ * mos7840_startup(), but it is not checked if
+ * kmalloc failed. So, mcs->ctrl_buf might be NULL.
+ * So, it should be checked here.
+ */
+ if (!buffer)
+ return -ENOMEM;
+
// dr=(struct usb_ctrlrequest *)(buffer);
dr = (void *)(buffer + 2);
dr->bRequestType = MCS_RD_RTYPE;