Author: hselasky
Date: Sat Dec 19 11:03:54 2020
New Revision: 368801
URL: https://svnweb.freebsd.org/changeset/base/368801

Log:
  Ensure a minimum packet length before creating a mbuf in if_ure.
  
  Sponsored by: Mellanox Technologies // NVIDIA Networking

Modified:
  head/sys/dev/usb/net/if_ure.c

Modified: head/sys/dev/usb/net/if_ure.c
==============================================================================
--- head/sys/dev/usb/net/if_ure.c       Sat Dec 19 11:03:04 2020        
(r368800)
+++ head/sys/dev/usb/net/if_ure.c       Sat Dec 19 11:03:54 2020        
(r368801)
@@ -711,7 +711,7 @@ ure_bulk_read_callback(struct usb_xfer *xfer, usb_erro
                                goto tr_setup;
                        }
 
-                       if (len != 0)
+                       if (len >= (ETHER_HDR_LEN + ETHER_CRC_LEN))
                                m = ure_makembuf(pc, off, len - ETHER_CRC_LEN);
                        else
                                m = NULL;
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