[PATCH] USB: Gadget RNDIS fix alloc bug. (buffer overflow)

Remote NDIS response to OID_GEN_SUPPORTED_LIST only allocated space
for the data attached to the reply, and not the reply structure
itself. This caused other kmalloc'd memory to be corrupted.

Signed-off-by: Shaun Tancheff <shaun@tancheff.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/usb/gadget/rndis.c b/drivers/usb/gadget/rndis.c
index 9689efeb364c..6d6eaad73968 100644
--- a/drivers/usb/gadget/rndis.c
+++ b/drivers/usb/gadget/rndis.c
@@ -853,11 +853,14 @@ static int rndis_query_response (int configNr, rndis_query_msg_type *buf)
         // DEBUG("%s: OID = %08X\n", __FUNCTION__, cpu_to_le32(buf->OID));
         if (!rndis_per_dev_params [configNr].dev) return -ENOTSUPP;
         
-        /* 
-         * we need more memory: 
-         * oid_supported_list is the largest answer 
+        /*
+         * we need more memory:
+         * gen_ndis_query_resp expects enough space for
+         * rndis_query_cmplt_type followed by data.
+         * oid_supported_list is the largest data reply
          */
-        r = rndis_add_response (configNr, sizeof (oid_supported_list));
+        r = rndis_add_response (configNr,
+                sizeof (oid_supported_list) + sizeof(rndis_query_cmplt_type));
         if (!r)
                 return -ENOMEM;
         resp = (rndis_query_cmplt_type *) r->buf;