print_unknown_data(netdissect_options *ndo, const u_char *cp,const char *ident,int len)
{
	if (len < 0) {
          ND_PRINT((ndo,"%sDissector error: print_unknown_data called with negative length",
		    ident));
		return(0);
	}
	if (ndo->ndo_snapend - cp < len)
		len = ndo->ndo_snapend - cp;
	if (len < 0) {
          ND_PRINT((ndo,"%sDissector error: print_unknown_data called with pointer past end of packet",
		    ident));
		return(0);
	}
        hex_print(ndo, ident,cp,len);
	return(1); /* everything is ok */
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.